P0655 Engine Hot Lamp Output Control Circuit Malfunction

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Cost of diagnosing the P0655 code

P0655 is a diagnostic trouble code (DTC) for "Engine Hot Lamp Output Control Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
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P0655 code definition

A P0655 code means that the powertrain control module (PCM) has detected that there is an abnormal voltage reading coming from the engine hot lamp output circuit.

What the P0655 code means

The P0655 is an OBD-II generic code which indicates that the circuitry meant to relay a pending engine overheat is experiencing a voltage-related malfunction. Typically, it means that there is a problem in the circuitry that operates this system.

What causes the P0655 code?

A P0655 is caused by one of the following:

  • Defective circuitry in the system, possibly due to corroded, broken or loose wiring or connections between the PCM and the sensor.
  • Defective PCM
  • An engine over temp indicator bulb malfunction
  • Engine temperature sensor defect

What are the symptoms of the P0655 code?

The P0655 code has few symptoms and will often only store the code. However, it may trigger a check engine light or a flashing engine temperature indicator.

How does a mechanic diagnose the P0655 code?

The P0655 is diagnosed with an OBD-II scanner, and it is important to pay attention to other codes relating to engine temperature that may have been stored before the P0655. Freeze frame data is important to proper diagnosis, and resetting, road testing and retesting the vehicle is the next step. If the code returns, visually inspect the wiring and connections, replacing or repairing any components, fuses, wiring and connectors where needed. Retest the system and use the freeze frame data and codes to identify the issue.

It is highly recommended to use a manufacturer's suggested testing method when forced to diagnose individual control models. Replacing only as required, and reprogramming the PCM. It may be necessary to use an Autohex or Tech II scanner because of the complexity of the electrical system testing and then repair any open or shorted circuits as needed.

Common mistakes when diagnosing the P0655 code

Diagnostic errors tend to occur when a mechanic does not compare their findings against a manufacturer's reference values. Additionally, it is important to perform a close visual exam to find any loose connectors that cause such codes as the P0655 to be stored. A common misdiagnosis is to replace the engine coolant temperature sensor though it is the PCM driver that is causing the problem.

How serious is the P0655 code?

The P0655 code will not prevent the car from starting, but it can be that the vehicle has a faulty sensor that could easily lead to an overheating issue.

What repairs can fix the P0655 code?

The most common repairs used for P0655 are:

  • Checking the code with a scanner, resetting and doing a road test to see if the P0655 code returns.
  • Visually inspecting all electrical connections, the PCM and the engine wiring harness. Any damaged, disconnected or corroded components, wires, or connectors will be repaired and reinstalled.
  • Though individual control modules rarely fail, they will be tested according to manufacturer's specs and replaced if needed. The PCM is then reprogrammed.

Additional comments for consideration regarding the P0655 code

The PCM needs accurate data from the engine in order to control many other areas of the vehicle. This is why this code must be diagnosed starting with the PCM and the engine wiring harnesses, grounds straps or wires and all electrical connections. The CAN bus network is also a huge part of this repair, but you should not attempt to manually check the wires as a probe can cause multiple controller failures if used improperly.

Need help with a P0655 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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P0655
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Anthony

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Anthony was great! We are very happy that we chose to go with this company instead of the overpriced and slow service we get from the Jeep dealership. He was on time and did the job just as expected. He identified a couple of other things that need to be done before the problems get worse. We appreciate having a technician give us direct feedback regarding our vehicle, rather than a service advisor (salesperson) that we've had to deal with in the past at the dealership. We'll be booking the addtional services very soon and will definitely request Anthony again now that he is familiar with our vehicle!

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37 years of experience
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37 years of experience
Subaru Forester - Check Engine Light is on - Santa Fe Springs, California
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6 years of experience
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Anthony
6 years of experience
BMW 740Li - Check Engine Light is on - Roseville, California
Very helpful in finding out the fault codes in my bmw 740 li. It was simple fix and that the two tube hose just had to be connected and my drive train malfunction went away. This saved me from having to go the an expensive dealership. Anthony has a good attitude about his work.

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Ram 1500 - Check Engine Light is on - Houston, Texas
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