P112F CADILLAC – Radiator Coolant Temperature Sensor

P112F CADILLAC Possible Causes

  • Faulty radiator coolant temperature sensor
  • Radiator coolant temperature sensor harness is open or shorted
  • Poor electrical connection in the radiator coolant temperature sensor circuit

How to Fix P112F CADILLAC Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or service engine soon warning light)

P112F CADILLAC Meaning

The Engine Radiator Coolant Temperature (RCT) sensor is a variable resistor that measures the engine coolant temperature in the radiator. The Engine Control Module (ECM) provides 5 volts to the engine radiator coolant temperature signal circuit and provides ground to the low reference circuit. The purpose of this diagnostic is to determine if the RCT sensor input is hotter than normal. The internal clock of the ECM will record how long the engine is off. If the required engine off time is met at startup, the ECM will compare the temperature difference between the actually measured RCT and ECT sensors.

P112F GMC Code: Radiator Temperature Sensor Problem

The P112F code on GMC vehicles indicates a malfunction of the Radiator Coolant Temperature (RCT) sensor. The ECM compares data from the RCT sensor with that from the Engine Coolant Temperature (ECT) sensor. If the difference exceeds specifications after the engine has been shut down, the code is stored.

Common Symptoms

  • Check Engine Light On (P112F code sometimes accompanied by P0116-P0118).
  • Radiator Fan Running Continuously.
  • Potential Overheating if the cooling system does not regulate correctly.

Main Causes

Category Details
Faulty RCT Sensor Internal resistance out of specifications (typically 200–5,000 Ω depending on temperature).
Electrical Issues Cut wiring, short circuit, or corroded connector (5V or ground wires).
Faulty ECM Damaged 5V signal or reference circuit.
Coolant Problem Low level, air bubbles, or stuck thermostat.

Diagnostic Steps

1. Preliminary Checks

  • Coolant Level: Top up if necessary (50% antifreeze mixture).
  • Air Bleed: Avoid air bubbles in the circuit (specific GMC procedure).

2. RCT Sensor Test

  • Location: On the radiator or lower hose.
  • Resistance: Disconnect the connector and measure with a multimeter:
    • When Cold (20°C): ~3,500 Ω.
    • When Hot (90°C): ~200 Ω.
  • ECT/RCT Comparison: Use a scan tool to check temperature consistency (max. 10°C difference after engine shutdown).

3. Electrical Inspection

  • 5V Power Supply: Measure voltage between the signal wire and ground (engine off).
  • Continuity: Check wires between the sensor and ECM (no short circuit or break).

4. Thermostat Test

  • Operation: Check for progressive opening starting at 90°C (marker on the thermostat).
  • Replacement: If stuck open/closed (cost: €30–100).

Solutions and Costs

Problem Solution Cost (€)
Faulty RCT Sensor Replace with an OEM part (e.g., ACDelco 213-4484). 50–120
Damaged Wiring Repair the harness or replace the connector. 30–150
Faulty ECM Reprogramming or replacement (at a dealership). 500–1,200

Best Practices

  • Use Dex-Cool coolant (specific to GMC) to avoid corrosion.
  • Reset the ECM after repair to clear adaptations.

FAQ

Q: Can I drive with a P112F code?
A: Yes, but monitor the temperature. Overheating can damage the engine.

Q: Why does the code return after replacing the sensor?
A: Check the wiring or thermostat. A clogged circuit or ECM fault may persist.

P112F MINI – Manifold Absolute Pressure at Accelerator Angle Too High, Bank 1

P112F MINI Possible Causes

  • Faulty intake pipe vacuum sensor
  • Intake pipe vacuum sensor harness is open or short-circuited
  • Poor electrical connection in the intake pipe vacuum sensor circuit
  • Faulty throttle body

How to Fix P112F MINI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P112F MINI Meaning

The Manifold Absolute Pressure (MAP) sensor is used to monitor engine load by sampling the vacuum in the intake manifold. At idle, a high vacuum will exist because the throttle is in the idle load position and the engine cylinders act as an air pump against a restriction. A higher vacuum exists during overrun conditions because the accelerator is in the idle load position and the engine speed is high. The intake manifold vacuum disappears when the throttle is open and the intake manifold pressure is approximately equal to atmospheric pressure. A higher vacuum exists during overrun conditions because the accelerator is in the idle load position and the engine speed is high.
The MAP sensor signal can be used to calculate the amount of fuel injection, the ignition advance or retard rate, boost pressure control, and idle control.
The Digital Motor Electronics (DME) monitors the plausible throttle position relative to the vacuum applied in the intake pipe. The Diagnostic Trouble Code (DTC) is recognized when the monitored mass flow exceeds a limit value.

P1130 – Swirl Control Valve Control Solenoid Valve

P1130 Possible Causes

  • Faulty swirl control valve control solenoid valve
  • The swirl control valve control solenoid valve circuit is open or shorted
  • The swirl control valve circuit is open or shorted
  • Faulty swirl control valve
  • Faulty swirl control valve actuator

How to Fix Code P1130?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check engine light on (or service engine soon warning light)

P1130 Meaning

This system has a swirl control valve in the intake passage of each cylinder.
At idle and during low engine speed operation, the swirl control valve closes. This increases the air speed in the intake passage, promoting fuel vaporization and creating a swirl in the combustion chamber.
Due to this operation, this system tends to increase the combustion speed of the gas mixture, improve fuel consumption, and enhance stability under operating conditions.
Additionally, except at idle and during low engine speed operation, this system opens the swirl control valve. In this condition, the system tends to increase power by improving intake efficiency through reduced intake flow resistance.
The solenoid valve controls the closed/open condition of the swirl control valve. This solenoid valve is operated by the engine control module (ECM).
The swirl control valve control solenoid valve responds to signals from the ECM. When the ECM sends an ON signal (ground), the solenoid valve is bypassed to apply intake manifold vacuum to the swirl control valve actuator. This operation closes the swirl control valve. When the ECM sends an OFF signal, the vacuum signal is cut off and the swirl control valve opens.

P1130 FORD F150 – Lack of Upstream Heated Oxygen Sensor Switch, Adaptive Fuel Limit, Row 1

P1130 FORD F150 Possible Causes

  • Faulty upstream oxygen sensor, bank 1
  • High or low fuel pressure
  • Dirty/faulty MAF sensor
  • Engine vacuum leak
  • Leaking fuel injector or fuel pressure regulator
  • Faulty Powertrain Control Module (PCM)

How to Fix P1130 Code FORD F150?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The Heated Exhaust Gas Oxygen Sensor (HEGO) sensor is monitored for switching. The test fails when the HO2S fails to switch due to a circuit or fuel at or exceeding a calibrated limit.

Possible Symptoms

  • Check Engine Light on (or Service Engine Soon warning light)

P1130 FORD F150 Meaning

The Heated Oxygen Sensor (HO2S) Monitor is an onboard strategy designed to monitor the HO2S sensors for any malfunction or deterioration that could affect emissions. Under specific conditions, the fuel control or upstream HO2S sensors are checked for proper output voltage and response rate (the time it takes to switch from lean to rich or rich to lean). The downstream HO2S sensors used for Catalyst Monitor are also monitored for proper output voltage. An input is required from the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT), Intake Air Temperature (IAT), Mass Air Flow (MAF), Throttle Position (TP), and Crankshaft Position (CKP) to activate the HO2S Monitor. The Fuel System Monitor and Misfire Detection Monitor must also have completed successfully before the HO2S Monitor is activated.
• The HO2S detects the oxygen content in the exhaust stream and delivers a voltage between zero and 1.0 volt. At lean stoichiometry (air/fuel ratio of about 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. At rich stoichiometry, the HO2S will generate a voltage between 0.45 and 1.0 volt.

• The HO2S Monitor evaluates both the upstream (fuel control) and downstream (catalyst monitor) HO2S for proper operation.
• Once the HO2S Monitor is activated, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum threshold voltage that can be calibrated.
• A fixed frequency closed-loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and
measuring the current through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.

P1130 TOYOTA CAMRY – A/F Sensor Circuit Range / Performance Malfunction

P1130 TOYOTA CAMRY Possible Causes

  • Faulty Air/Fuel Ratio (A/F) Sensor, Bank 1 Sensor 1
  • Air/Fuel Ratio (A/F) Sensor, Bank 1 Sensor 1 Circuit Open or Shorted
  • Air/Fuel Ratio (A/F) Sensor, Bank 1 Sensor 1 Circuit Poor Electrical Connection
  • Fuel Pressure
  • Fuel Injector
  • Intake Air Leaks
  • ECM

How to Fix Code P1130 TOYOTA CAMRY?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

Code 1130 is set when the A/F sensor output voltage change value is not what the Engine Control Module (ECM) expects.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1130 TOYOTA CAMRY Meaning

The Air/Fuel Ratio (A/F) sensor varies its output voltage proportionally to the air/fuel ratio. Based on the output voltage, the Engine Control Module (ECM) determines whether the air/fuel ratio is RICH or LEAN and adjusts it to the stoichiometric air/fuel ratio. The ECM also checks the fuel injection volume compensation value to verify whether the A/F sensor is deteriorating or not. Deterioration of the A/F sensor response is determined by the ratio between the A/F sensor output voltage change and the fuel compensation change.

P1130 INFINITI I30 – Turbulence Control Valve Control Solenoid

P1130 INFINITI I30 Possible Causes

  • Faulty swirl control valve control solenoid valve
  • Swirl control valve control solenoid valve circuit open or shorted
  • Swirl control valve circuit open or shorted
  • Faulty swirl control valve
  • Faulty swirl control valve actuator

How to Fix Code P1130 INFINITI I30?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The P1130 code is detected when an incorrect voltage signal is sent to the Engine Control Module (ECM) via the swirl control valve control solenoid valve.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1130 INFINITI I30 Meaning

This system has a swirl control valve in the intake passage of each cylinder.
At idle and during low engine speed operation, the swirl control valve closes. This increases the air speed in the intake passage, promoting fuel vaporization and creating a swirl in the combustion chamber.
Due to this operation, this system tends to increase the combustion speed of the gas mixture, improve fuel consumption, and enhance stability under operating conditions.
Additionally, except at idle and during low engine speed operation, this system opens the swirl control valve. In this condition, the system tends to increase power by improving intake efficiency through reduced intake flow resistance.
The solenoid valve controls the closed/open condition of the swirl control valve. This solenoid valve is operated by the Engine Control Module (ECM).
The swirl control valve control solenoid valve responds to signals from the ECM. When the ECM sends an ON signal (ground), the solenoid valve is bypassed to apply intake manifold vacuum to the swirl control valve actuator. This operation closes the swirl control valve. When the ECM sends an OFF signal, the vacuum signal is cut off and the swirl control valve opens.

P1130 AUDI – Long Term Fuel Trim System B2 Too Lean

P1130 AUDI Possible Causes

  • Faulty mass air flow (MAF) sensor
  • High fuel pressure
  • Engine vacuum leak
  • Faulty HO2S Bank 1

How to Fix P1130 AUDI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P1130 AUDI Meaning

The long-term fuel trim system B2 too lean is the generic description for Audi P1130 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have more information about the Audi P1130 OBDII code.

P1130 BMW – Oxygen Sensor Behind Catalytic Converter Aging

P1130 BMW Possible Causes

  • Faulty oxygen sensor
  • Oxygen sensor harness is open or shorted
  • Poor electrical connection in oxygen sensor circuit

How to Fix BMW P1130 Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light on (or soon-to-be-serviced engine warning light)

P1130 BMW Meaning

The oxygen sensor behind the catalytic converter aging is the generic description for Bmw P1130 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have more information about the OBDII P1130 Bmw code.

P1130 BUICK – Low Variance in HO2S Circuit, Bank 1 Sensor 1

P1130 BUICK Possible Causes

  • Faulty Heated Oxygen Sensor (HO2S), Bank 1 Sensor 1
  • Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 harness is open or shorted
  • Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 circuit poor electrical connection

How to Fix P1130 BUICK Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1130 BUICK Meaning

The Powertrain Control Module (PCM) monitors the Heated Oxygen Sensor (HO2S) activity for 60 seconds. During this period, the PCM counts the number of times the HO2S switches from rich to lean and from lean to rich.