Powertrain Codes

P0027

Technical Definition:

Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1

Trouble Code: P0027
Address: 0x0027
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:
  • Low engine oil level or contaminated oil
  • Clogged oil system
  • Malfunctioning control solenoid
  • Malfunctioning camshaft actuator
  • Timing chain/belt loose or incorrectly adjusted
  • Malfunctioning ECM/PCM

Possible Symptoms:
  • MIL (Malfunction Indicator Lamp) illumination
  • Poor acceleration or engine performance
  • Decreased fuel economy

Exhaust Valve Control solenoid Circuit Range/Performance Bank 1

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Specific Makes:

P0028

Technical Definition:

Intake Valve Control Solenoid Circuit Range/Performance Bank 2

Trouble Code: P0028
Address: 0x0028
System: Powertrain
Subsystem:
Technical Description:

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Possible Symptoms:

Intake valve Control Solenoid Circuit Range/Performance Bank 2

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Specific Makes:

P0029

Technical Definition:

Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2

Trouble Code: P0029
Address: 0x0029
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:
  • Low engine oil level or contaminated oil
  • Clogged oil system
  • Malfunctioning control solenoid
  • Malfunctioning camshaft actuator
  • Timing chain/belt loose or incorrectly adjusted
  • Malfunctioning ECM/PCM

Possible Symptoms:
  • MIL (Malfunction Indicator Lamp) illumination
  • Poor acceleration or engine performance
  • Decreased fuel economy

Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

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Specific Makes:

P0026

Technical Definition:

Intake Valve Control Solenoid Circuit Range / Performance (Bank 1)

Trouble Code: P0026
Address: 0x0026
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

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Intake Valve Control Solenoid Circuit Range/Performance Bank 1

Possible Solutions:

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Specific Makes:

P0021

Technical Definition:

A Camshaft Position (CMP) Timing Over – Advanced or System Performance (Bank 2)

Trouble Code: P0021
Address: 0x0021
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
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Specific Makes:

P0024

Technical Definition:

B Camshaft Position (CMP) Timing Over – Advanced or System Performance (Bank 2)

Trouble Code: P0024
Address: 0x0024
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

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Specific Makes:

P0020

Technical Definition:

A Camshaft Position (CMP) Actuator Circuit / Open (Bank 2)

Trouble Code: P0020
Address: 0x0020
System: Powertrain
Subsystem: Fuel & Air metering, Auxiliary emission controls
Technical Description:

Possible Causes:
  • Faulty oil control valve (OCV)
  • Open or short in the VVT/VCT circuit
  • Open or short in the OCV / solenoid valve
  • Damaged computer (PCM)

Possible Symptoms:
  • Check Engine Light illuminated (Malfunction Indicator Lamp)
  • Rough running
  • other symptoms may also be present

Possible Solutions:
  • Carefully inspect the Bank 2 VVT/VCT system circuit wiring and connectors, repair as required
  • With a warm engine, test the operation of the OCV, replace/repair as needed

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