P064C Glow plug control module
Content
P064C Glow plug control module
OBD-II DTC Datasheet
Glow plug control module
What does this mean?
This is a generic Diagnostic Trouble Code (DTC) applicable to many OBD-II vehicles (1996 and newer). This may include, but is not limited to, Chrysler, Ford, General Motors, Mercedes-Benz, Nissan, Toyota, etc. Despite the general nature, the exact repair steps may vary depending on the year of manufacture, make, model and configuration. transmissions.
A stored code P064C means the powertrain control module (PCM) has detected a malfunction in the glow plug control module.
The glow plug control module is responsible for starting the glow plug and glow plug heater timer for each individual cylinder. Glow plugs, glow plug timer and glow plug controller are used exclusively in diesel powered vehicles.
The glow plug control module can be self-contained, but most often it is an integral part of the PCM.
Each time the ignition is turned on and power is applied to the PCM, several controller self-tests are performed. By performing a self-test on the controller, the PCM can monitor the serial data that is sent over the controller network (CAN) to ensure that onboard controllers are communicating as expected.
If a problem is detected while monitoring the glow plug control module, a P064C code will be stored and a malfunction indicator lamp (MIL) may illuminate.
Typical glow plug: 
What is the severity of this DTC?
Glow plug control module codes can cause the glow plug to fail and create a condition where the engine will not start. P064C should be classified as serious.
What are some of the symptoms of the code?
Symptoms of a P064C trouble code may include:
- One or more broken glow plugs
- Delay in starting the engine (especially in cold weather)
- Engine stall at start
- Engine control problems
- Other stored codes
What are some of the common causes for the code?
Reasons for this code may include:
- Defective glow plug controller or PCM
- Open circuit of the power supply of the glow plug control module
- PCM programming error
- Open or short circuit in the glow plug control circuit
What are some steps to troubleshoot the P064C?
Diagnosing a P064C code will require a diagnostic scanner, a digital volt / ohmmeter (DVOM), and a reliable vehicle information source.
Consult your vehicle information source for technical service bulletins (TSBs) that reproduce the stored code, vehicle (year, make, model and engine) and symptoms detected. If you find an appropriate TSB, it can provide useful diagnostic information.
Start by connecting the scanner to the vehicle's diagnostic port and retrieving all stored codes and freeze frame data. You will want to write this information down just in case the code turns out to be intermittent. After recording all relevant information, clear the codes and test drive the vehicle (if possible) until the code is cleared or the PCM enters standby mode.
If the PCM enters ready mode, the code is intermittent and harder to diagnose. The condition that led to the persistence of P064C may need to worsen before an accurate diagnosis can be made. If the code is cleared, continue diagnostics.
Use your vehicle information source to obtain connector views, connector pinouts, component locators, wiring diagrams, and diagnostic block diagrams relevant to the code and vehicle in question.
Check for battery voltage on the glow plug control circuit using the appropriate wiring diagram and your DVOM. If not, check system fuses and relays and replace defective parts if necessary.
If there is no voltage (and / or ground) in the glow plug control circuit (and all fuses and relays are working properly), then the wiring and harness associated with the controller must be checked. You will also want to check the chassis and motor ground connections. Use your vehicle information source to obtain grounding locations for associated circuits.
If voltage (and ground) is present in the glow plug control circuit, check the system controllers for signs of water damage, heat, or collision. Any controller damaged (especially by water) should be considered defective.
If the power and ground circuits of the controller are intact, suspect a faulty controller or a controller programming error. Replacing the controller will require reprogramming.
- Check the ground integrity of the controller by connecting the negative test lead of the DVOM to ground and the positive test lead to the battery voltage.
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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.
