PCM

EOBD fault codes P0660-P0665

P0600

Serial Communication Link Malfunction

P0601

Internal Control Module Memory Check Sum Error

P0602

Control Module Programming Error

P0603

Internal Control Module Keep Alive Memory (KAM) Error

P0604

Internal Control Module Random Access Memory (RAM) Error

P0605

Internal Control Module Read Only Memory (ROM) Error
(Module Identification Defined by SAE J1979)

P0606

ECM/PCM Processor Fault

P0608

Control Module VSS Output “A” Malfunction

P0609

Control Module VSS Output “B” Malfunction

P0610

Control Module VSS Output “B” Malfunction

P0615

Starter Relay Circuit

P0616

Starter Relay Circuit Low

P0617

Starter Relay Circuit High

P0618

Alternative Fuel Control Module KAM Error

P0619

Alternative Fuel Control Module RAM/ROM Error

P0620

Generator Control Circuit Malfunction

P0621

Generator Lamp “L” Control Circuit Malfunction

P0622

Generator Field “F” Control Circuit Malfunction

P0623

Generator Lamp Control Circuit

P0624

Fuel Cap Lamp Control Circuit

P0630

VIN Not Programmed or Mismatch – ECM/PCM

P0631

VIN Not Programmed or Mismatch – TCM

P0635

Power Steering Control Circuit

P0636

Power Steering Control Circuit Low

P0637

Power Steering Control Circuit High

P0638

Throttle Actuator Control Range/Performance (Bank 1)

P0639

Throttle Actuator Control Range/Performance (Bank 2)

P0640

Intake Air Heater Control Circuit

P0645

A/C Clutch Relay Control Circuit

P0646

A/C Clutch Relay Control Circuit Low

P0647

A/C Clutch Relay Control Circuit High

P0648

Immobilizer Lamp Control Circuit

P0649

Speed Control Lamp Control Circuit

P0650

Malfunction Indicator Lamp (MIL) Control Circuit Malfunction

P0654

Engine RPM Output Circuit Malfunction

P0655

Engine Hot Lamp Output Control Circuit Malfunction

P0656

Fuel Level Output Circuit Malfunction

P0660

Intake Manifold Tuning Valve Control Circuit (Bank 1)

P0661

Intake Manifold Tuning Valve Control Circuit Low (Bank 1)

P0662

Intake Manifold Tuning Valve Control Circuit High (Bank 1)

P0663

Intake Manifold Tuning Valve Control Circuit (Bank 2)

P0664

Intake Manifold Tuning Valve Control Circuit Low (Bank 2)

P0665

Intake Manifold Tuning Valve Control Circuit High (Bank 2)

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Check Engine Light Code P0116

OBD II Code P0116
Engine Coolant Temperature Circuit Range/Performance Problem

Our emissions expert has put together the following information about the P0116 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

OBD II P0116
Fault Code Definition
The Engine Coolant Temperature Sensor measures the rise and fall of the Engine Coolant Temperature. This provides critical data needed for the Powertrain Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, the cooling fans, and many components of the Emissions Control Systems. Code P0116 indicates a performance problem with the sensor signal to the Powertrain Control Module.

Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting and/or get poor fuel economy
Common Problems That Trigger the P0116 Code

Defective Engine Coolant Temperature Sensor
Rusty and/or corroded Engine Coolant
Faulty or corroded Engine Coolant Temperature wiring or connections

Common Misdiagnoses

Engine Coolant Temperature Sensor is replaced when the real cause is rusty coolant
Engine Coolant Temperature Sensor is replaced when the real cause is a poor connection or chafed wiring
Engine Coolant Temperature Sensor is replaced when the real problem is in the Cooling System

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Check Engine Light Code P0122

Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input

Our emissions expert has put together the following information about the P0122 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.

OBD II Fault Code

OBD II P0122

Fault Code Definition
Code P0122 is triggered when the voltage output from the Throttle/Pedal Position Sensor/Switch to the PCM is too low.

The Throttle Position Sensor/Switch is located on the Throttle Body of the Intake Manifold and the Pedal Position Sensor/Switch is located on the Accelerator Pedal. These sensors provide precise input from the driver’s foot in terms of how much power is needed—and how urgently—from the engine.

As the Throttle Position Sensor is rotated from its base resting position to full acceleration, it sends a increasing voltage signal to the Powertrain Control Module (PCM). This decreasing or increasing voltage signal is used by the PCM to manage the Air Fuel Ratio and Spark Timing of the engine as well as other emissions system components.

Symptoms

Check Engine Light will illuminate
In many cases, no abnormal symptoms may be noticed
In some cases, the engine may be hard starting
In some cases, the engine may hesitate during acceleration
Common Problems That Trigger the P0122 Code

Defective Throttle Position Sensor or Switch
Torn or jammed floor mats
Faulty or corroded Throttle/Pedal Position Sensor/Switch wiring or connections
Common Misdiagnoses

Throttle or Pedal Position Sensor is replaced when the real problem is a poor connection or chafed wiring
Pedal Position Sensor is replaced when the real problem is torn or damaged floor mats

Possible Solutions

Some recommended troubleshooting and repair steps are:

Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it’s not rubbing on anything, grounding, etc. The code may come back.
Other TPS sensor and circuit related DTCs: P0120, P0121, P0123, P0124

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Check Engine Light Code P0102

Mass Air Flow (MAF) Circuit Low Input

Description:

How does a P0102 code trigger the check engine light? The engine light will come on if the following concern is present:

The Mass Air Flow Sensor circuit is monitored by the powertrain control module (computer), for low voltage (which translates to low air flow) through the Comprehensive Component Monitor (CCM). With the key on and engine running, if the voltage drops below a minimum value this code will be set, causing the check engine light to illuminate.

Possible Causes:

MAF Sensor disconnected
MAF Sensor circuit open to computer
Vehicle Power circuit open to MAF Sensor
Power Ground circuit open to MAF Sensor
MAF Sensor Return circuit open to PCM
MAF Sensor circuit shorted to Ground
Intake air leak near MAF Sensor
Damaged MAF Sensor
Damaged computer

Diagnostic Help:

Refer to an appropriate manual for specification. If MAF Sensor voltage reading is below minimum limit with key on engine running then concern is a hard fault (present now). If all values are in spec proceed with intermittent diagnosis (refer to our “Intermittent Diagnosis Help” article through the “articles” link on the Navigation Bar). You may also use the “Get Help” link if you need specifications or have any other related questions.

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Check Engine Light Code P0100

Mass Air Flow (MAF) Sensor

Description:

How does a P0100 code trigger the check engine light? This code will trigger the check engine light under the following conditions:

1. The computer receives an excessively high voltage from the MAF Sensor with the engine not running.
2. The computer receives an excessively low voltage from the MAF Sensor with the engine running.
3. The computer receives a high voltage reading from the MAF Sensor under light-load driving conditions.

Possible Causes:

MAF Sensor circuit open or shorted
Intake air leaks (unmetered air after MAF Sensor)
Defective MAF Sensor
Electronic Control Module (ECM)/Powertrian Control Module (PCM) concern

Diagnostic Help:

Monitor MAF Sensor voltage reading while increasing engine RPM. The MAF Sensor value should increase in proportion to engine speed. If not, first check for air leaks at intake tube, manifold and all vacuum lines. Then test the MAF Sensor circuits for opens and shorts. See our article Automotive Circuit Testing 101, if you need more assistance with this. If concern is determined to be intermittent, wiggle test connectors and wiring to attempt to duplicate concern. You may also use the “Get Help” link if you need specifications or have any other related questions. Remember to refer to an appropriate manual for specific instruction.

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