P1252 VOLKSWAGEN – Cold Start Injector Open / Short to Ground

P1252 VOLKSWAGEN Possible Causes

  • Faulty cold start injector
  • Cold start injector harness is open or shorted
  • Poor electrical connection in the cold start injector circuit

How is the P1252 VOLKSWAGEN code repair performed?

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

Possible Symptoms

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

P1252 VOLKSWAGEN Meaning

Cold Start Injector Open/Ground Short is the generic description for Volkswagen P1252 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have additional information about the Volkswagen P1252 OBDII code.

P1253 – VTEC System Malfunction

P1253 Possible Causes

  • Low engine oil level
  • Low engine oil pressure
  • Blocked oil passage
  • Faulty VCT oil control valve

How is code P1253 repaired?

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

Possible Symptoms

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

P1253 Meaning

The VTEC system, in conjunction with the Engine Control Module (ECM), activates the VTEC solenoid valve to control oil pressure to the VTEC mechanism which is installed in the valve system to switch valve timing between low and high. If the VTEC solenoid valve has an open circuit or short circuit, a DTC is stored.

P1253 ACURA – VTEC System Malfunction

P1253 ACURA Possible Causes

  • Low engine oil level
  • Low engine oil pressure
  • Blocked oil passage
  • Faulty VCT oil control valve

How is the P1253 ACURA code repair performed?

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

Technical Notes

If P1253 is present, begin by checking the engine oil level and condition. Change the engine oil and filter if necessary with the factory-recommended oil weight.

Possible Symptoms

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

P1253 ACURA Meaning

The VTEC system, in conjunction with the Engine Control Module (ECM), activates the VTEC solenoid valve to control oil pressure to the VTEC mechanism, which is installed in the valve system to switch valve timing between low and high. If the VTEC solenoid valve has an open circuit or a short circuit, a DTC is recorded.

P1253 HONDA – VTEC System Malfunction

Honda Code P1253 – VTEC Solenoid Valve Circuit Malfunction

Meaning: The engine control module (ECM) has detected an electrical fault (open or short circuit) in the VTEC solenoid valve circuit. This system uses oil pressure to activate the variable valve timing mechanism.

Probable Causes

Failure Type Components Involved
Electrical Issues

  • Short circuit/open in the solenoid wiring

  • Damaged connectors (oxidized, bent, or dislodged pins)

  • VTEC solenoid failure (coil out of specification)
    | Mechanical Issues |

  • Engine oil level too low

  • Insufficient oil pressure (faulty oil pump)

  • Blockage in oil passages (dirt, deposits)

  • VTEC solenoid stuck or clogged |
    | Other |

  • Degraded or incorrect viscosity engine oil

  • Clogged oil filter

  • ECM failure (rare) |

Common Symptoms

  • 🟠 Engine light on (Check Engine)

  • Loss of power at high RPM (> 4,500 RPM)

  • VTEC engagement RPM not reached

  • Abnormal clicking noises from the cylinder head

  • Excessive oil consumption

Diagnostic Procedure (Key Steps)

🔧 1. Preliminary Checks (Critical)

  • Check oil level: On a flat surface, when cold.

  • Inspect oil condition:

    • If black/thick: Replace oil and filter (use OEM viscosity).

    • If low: Top up and check for leaks.

🔌 2. Electrical Inspection

Step Action Expected Values
Disconnect the solenoid Inspect connector and pins No corrosion/deformation
Measure resistance (solenoid terminals) Multimeter in Ω mode 14–30 Ω (Honda reference)
If out of specification → Replace solenoid
Test the circuit Check continuity between ECM and solenoid Resistance < 1 Ω
Check for short circuits to ground/battery No continuity (∞ Ω)

⚙️ 3. Mechanical Tests

  • Oil pressure:

    • Use a pressure gauge (specification: > 70 kPa at idle).

    • If low: Check oil pump, pressure sensor, strainer.

  • Solenoid unblocking:

    • Clean using an approved solvent (e.g., brake cleaner).

    • Test its freedom of movement.

📟 4. ECM Diagnosis

  • Scan with Honda (HDS) tool for:

    • Reading live data (VTEC command, oil pressure).

    • Performing an active test of the solenoid.

    • Checking for related fault codes (e.g., P2646).

Repair Solutions

Identified Cause Corrective Action
Low/degraded oil Top-up or complete oil change
Clogged oil filter Replace filter
Faulty wiring/connector Repair harness or replace connector
VTEC solenoid faulty Replace solenoid
Blocked oil passages Clean VTEC oil circuit
Insufficient oil pressure Diagnose oil pump/sensor

Post-Repair Validation:

  • Clear code with a Honda scanner.

  • Perform a drive cycle: Rev up to VTEC activation (∼ 5,000 RPM).

  • Confirm no reappearance of the engine light.

Honda Technical Tips

  • Recommended oil: 0W-20 or 5W-30 (follow service manual).

  • Common pitfalls:

    • A counterfeit oil filter can cause pressure drop.

    • Carbon deposits in the solenoid are common on engines > 150,000 km.

  • Safety: Always turn off ignition before disconnecting the solenoid.

Reference: HDS (Honda Diagnostic System) Procedures – Model-specific service manual.

P1253 ISUZU – VTEC System Malfunction

P1253 ISUZU Possible Causes

  • Low engine oil level
  • Low engine oil pressure
  • Blocked oil passage
  • Faulty VCT oil control valve

How is P1253 ISUZU Code Repaired?

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

Technical Notes

If P1253 is present, start by checking the engine oil level and condition. Change the engine oil and filter if necessary with the factory-recommended oil weight.

Possible Symptoms

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

P1253 ISUZU Meaning

The VTEC system, in conjunction with the Engine Control Module (ECM), activates the VTEC solenoid valve to control oil pressure to the VTEC mechanism which is installed in the valve system to switch valve timing between low and high. If the VTEC solenoid valve has an open circuit or short circuit, a DTC is recorded.

P1253 SAAB – Fully Open Signal of Throttle Position Motor During Startup

P1253 SAAB Possible Causes

  • A mechanical fault prevents the throttle from closing.
  • Faulty throttle motor
  • Throttle motor wiring harness is open or short-circuited
  • Poor electrical connection in the throttle motor circuit

How is the P1253 SAAB code repaired?

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

Possible Symptoms

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

P1253 SAAB Meaning

The throttle position motor wide open signal during startup is the generic description for Saab P1253 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information on the Saab P1253 OBDII code.

P1254 – PDS2 and LPDS High Pedal Correlation

How is the P1254 code repair performed?

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

Possible Symptoms

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

P1254 Meaning

Pedal Correlation PDS2 and LPDS High is the generic description for code P1254, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the P1254 OBDII code.

P1255 – High Temperature Fuel Pump Control Module Driver

P1255 Possible Causes

  • Faulty fuel pump control module
  • Fuel pump control module harness is open or shorted
  • Poor electrical connection in the fuel pump control module circuit

How is code P1255 repaired?

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

Possible Symptoms

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

P1255 Meaning

The engine control module (ECM) provides voltage to the fuel pump control module when the ECM detects that the ignition is turned on. The voltage from the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is running or starting. While this voltage is being received, the fuel pump control module provides variable voltage to the fuel tank pump module to maintain the desired fuel pressure. The diagnostic trouble code (DTC) will be set if the fuel pump control module detects an overheating fault.

P1255 AUDI – Engine Coolant Temperature Sensor Circuit Short to Ground

P1255 AUDI Possible Causes

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

How is P1255 AUDI Code Repaired?

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

Possible Symptoms

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

P1255 AUDI Meaning

Engine Coolant Temperature Sensor Circuit Shorted to Ground is the generic description for Audi P1255 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information on the Audi P1255 OBDII code.

P1255 BUICK – High Temperature Fuel Pump Control Module Driver

P1255 BUICK Possible Causes

  • Faulty fuel pump control module
  • Fuel pump control module harness is open or shorted
  • Poor electrical connection in fuel pump control module circuit

How is P1255 BUICK Code Repair Done?

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

Possible Symptoms

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

P1255 BUICK Meaning

The engine control module (ECM) provides voltage to the fuel pump control module when the ECM detects that the ignition is turned on. The voltage from the ECM to the fuel pump control module remains active for 2 seconds, unless the engine is running or cranking. While this voltage is being received, the fuel pump control module provides variable voltage to the fuel tank pump module to maintain the desired fuel pressure. The diagnostic trouble code (DTC) will be set if the fuel pump control module detects an overheating fault.