P135A Code – Ignition Coil Power Circuit, Row 1

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

P135A Chevrolet Code – Ignition Coil Control Circuit, Bank 1

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

P135B Code – Ignition Coil Power Supply Circuit, Row 2

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

BMW Code P135B – Knock Sensor 2 Signal Not Plausible

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty knock sensor
  • Knock sensor harness is open or shorted
  • Poor electrical connection in the knock sensor circuit

Description

The Engine Control Module (ECM) monitors the knock sensor. The ECM sets the OBDII code when the knock sensor does not meet factory specifications.

How to Repair

Check 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 on)

P135B Code Buick – Ignition Coil Power Supply Voltage Circuit, Row 2

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

P135B Cadillac Code – Ignition Coil Power Supply Voltage Circuit, Row 2

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

P135B Chevrolet Code – Ignition Coil Supply Voltage Circuit, Row 2

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

GMC Code P135B – Ignition Coil Power Circuit, Row 2

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Blown ignition coil fuse
  • Ignition coil fuse circuit open or shorted
  • Poor electrical connection in ignition coil fuse circuit
  • Faulty Engine Control Module (ECM)

Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

How to Repair

Check 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

  • Illuminated engine light (or service engine soon warning light illuminated)

P135C Code – Cooling Fan 1 Status Signal Counter Incorrect

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty cooling fan 1
  • Cooling fan 1 harness is open or shorted
  • Poor electrical connection in cooling fan 1 circuit

Description

The control modules connected to the serial data circuits monitor communication during normal vehicle operation. Operating information and commands are exchanged between control modules. Each module in the serial data circuit maintains a transmission error counter and a reception error counter. The counter values increase with detected errors and decrease with error-free messages. The diagnostic trouble code (DTC) is set when the counter for cooling fan 1 status signals is incorrect.

How to Repair

Check 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

  • Malfunction Indicator Lamp illuminated (or Service Engine Soon warning light illuminated)

P135D Code – Cooling Fan 2 Status Signal Counter Incorrect

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty Cooling Fan 2
  • Cooling Fan 2 Circuit Open or Shorted
  • Poor Electrical Connection in Cooling Fan 2 Circuit

Description

Control modules connected to serial data circuits monitor communication during normal vehicle operation. Operating information and commands are exchanged between control modules. Each module in the serial data circuit maintains a transmission error counter and a reception error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) is set when the message counter for Cooling Fan 2 status signals is incorrect.

How to Repair

Check 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

  • Illuminated Malfunction Indicator Lamp (or Service Engine Soon Warning Light)