Powertrain Control Module

Fault codes P1600 to P1699

P1602

Loss of EBTCM Serial Data

P1603

Loss of SDM Serial Data

P1604

Loss of IPC Serial Data

P1605

Loss of HVACC Serial Data

P1605

Keep Alive Memory Failure (Ford)

P1605

Powertrain Control Module (Mazda)

P1607

Malfunction In PCM Internal Circuit (Acura)

P1610

Loss of PZM Serial Data

P1611

Loss of CVRTD Serial Data

P1617

Engine Oil Level Switch Circuit

P1621

PCM Memory Performance

P1626

Theft Deterrent System – Fuel Enable Circuit

P1630

Theft Deterrent – PCM in Learn Mode

P1631

Theft Deterrent – Password Incorrect

P1632

Theft Deterrent – Fuel Disabled

P1633

Ignition Supplement Power Circuit Low Voltage

P1633

Keep Alive Power Voltage Too Low (Ford)

P1634

Ignition 1 Power Circuit Low Voltage

P1635

5 Volt Reference Circuit (GM)

P1635

Tire/Axle Out Of Acceptable Range (Ford)

P1639

5 Volt Reference 2 Circuit (GM)

P1639

Vehicle ID Block Not Programmed Or Corrupt (Ford)

P1640

DTC’s Available In Another Module (Ford)

P1640

Driver 1 – Input High Voltage

P1641

Malfunction Indicator Lamp (MIL) Control Circuit

P1642

Vehicle Speed Output Circuit

P1644

Delivered Torque Output Circuit

P1645

EVAP Solenoid Output Circuit

P1646

EVAP Vent Valve Output Circuit

P1650

Driver 2 – Input High Voltage

P1650

Power Steering Pressure Switch Malfunction (Ford)

P1650

Power Steering Pressure Switch Out Of Range (Mazda)

P1651

Power Steering Pressure Switch Input Malfunction (Mazda)

P1651

Power Steering Pressure Switch Signal Malfunction (Ford)

P1652

Lift/Dive Circuit

P1654

Cruise Disable Output Circuit

P1656

Automatic Transaxle (Acura)

P1660

Cooling Fan Control Circuits

P1660

A/T FI Data Line Failure (Acura)

P1676

FPTDR Signal Failure (Acura)

P1678

FPTDR Signal Line Failure (Acura)

P1680

Clutch Released Switch Circuit (CHRYSLER)

P1681

No I/P Cluster CCD/J1850 Messages Received (CHRYSLER)

P1681

A/T FI Signal A Low Input (Acura)

P1682

A/T FI Signal A High Input (Acura)

P1682

Charging System Voltage Too Low (CHRYSLER)

P1683

Speed Control Power Relay or S/C 12V Driver Circuit (CHRYSLER)

P1685

Skim Invalid Key(CHRYSLER)

P1686

No SKIM Bus Message Received (CHRYSLER)

P1686

A/T FI Signal B Low Input (Acura)

P1687

A/T FI Signal B High Input (Acura)

P1687

No Cluster Bus Message (CHRYSLER)

P1689

Traction Control Delivered Torque Output Circuit (GM)

P1693

DTC Detected In Companion Mode (CHRYSLER)

P1694

Fault In Companion Mode (CHRYSLER)

P1695

No CCD/J185O Message From BCM (CHRYSLER)

P1696

PCM Failure EEPROM Write Denied (CHRYSLER)

P1697

PCM Failure SRI Mile Not Stored (CHRYSLER)

P1698

No Bus Message From TCM (CHRYSLER)

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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 P0171

System Too Lean – Bank 1

Description:

How does a P0171 code trigger the check engine light? This code will trigger the check engine light as follows:

The adaptive fuel strategy in the vehicle’s computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running. Please refer to our article Oxygen Sensor Code Diagnosis for more info on this system. A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.

Possible Causes:

Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. The following is an overview of P0171 check engine light code possible causes.

Fuel System:

Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)

Air Intake System

Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter

Exhaust System

Any exhaust leak before or near the oxygen sensors

EGR System

Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking

Secondary Air Injection System

Mechanically stuck secondary air injection valve

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