P0669 OBD Error Code: Problem & Solutions

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The error code P0669 can be defined as PCM/ECM/TCM Internal Temperature Sensor Circuit High. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

If the P0669 trouble code would start appearing, then it means that some fault in the internal temperature sensor circuit has been detected by the Powertrain Control Module (PCM), Engine Control Module (ECM), or Transmission Control Module (TCM). If this trouble code is not treated properly, then it can eventually lead to a catastrophic failure of the vehicle.

What causes this problem with the PCM/ECM/TCM Internal Temperature Sensor Circuit High?

• Defects in the temperature sensor in the engine or transmission
• The wiring in the temperature sensor circuits might have some flaws
• Overheating in the transmission
• Some defects in the wiring
• Quirks in the PCM, ECM or TCM
• Loose or defective control module ground strap

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2. Powertrain Control Module - A lot of issues can arise do to defective Powertrain Control Module. Did you just see P0669 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
3. Body Control Module - Faulty Body Control Module can be the reason why P0669 code is flashing. Visit us to purchase top notch Body Control Module online.
4. Engine Control Module - It is an important auto part which needs full care. A faulty Engine Control Module can be a reason behind the flashing up of P0669 code.
5. Automatic Transmission Sensor - OBD Code P0669 can appear because of faulty Automatic Transmission Sensor.
6. ABS System Parts - P0669 error code also relates to problems with the ABS System Parts. Find all the ABS System Parts with us.
7. Auto Transmission Shift Solenoid - OBD Error Code P0669 can simply be due to faulty Auto Transmission Shift Solenoid. Replace old and damage components now!

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0669 here:

Common Symptoms

• Transmission warning lamp can start flashing
• Improper Shifting
• Appearance of the check engine light
• Engine may stall
• Engine might not start at all

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• You can always replace the wiring, connectors, or other components related to the control module
• Make sure that the engine or transmission cables, wires, or straps are properly secured or re-attached
• Restore the faulty powertrain control module
• The wiring or connectors within the CAN Bus harness should be replaced as per the requirement

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Here are some steps which you should follow in order to diagnose this fault code:

• Start your diagnosis by testing all power and ground circuits for the affected module. Compare your findings with manufacturer’s specifications and make necessary repairs. Be sure to clear all trouble codes and retest the system in order to ensure that the condition is rectified. If all power and ground circuits align with the manufacturer’s specifications, suspect a faulty control module
• Control module replacement will also require reprogramming it to match the vehicle. CAN stands for “controller area network.” The CAN represents a communication bus that allows multiple microcontrollers to communicate with one another without the need for a host computer
• The CAN bus network is actually a complex conglomeration of wiring harnesses and connectors used as a pipeline of information shared between two or more automotive control modules
• These controllers control virtually every electrical function of the vehicle, with the PCM being the primary controller
• The cruise control module uses the data for speed control purposes, the traction control system uses the data to regulate vehicle traction control strategy, and the anti-lock brake controller compares vehicle speed from the PCM with data inputs from individual wheel speed sensors to operate the anti-lock braking system
• Several tools will be instrumental in attempting to successfully diagnose this code. A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in trying to perform a successful diagnosis
• Then start with a visual inspection of all wiring and connectors
• Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary. Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data
• Continue by clearing the code and operating the vehicle to see if it returns. This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns. If the code fails to immediately return, you may have an intermittent condition
• Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can even be attempted. Disconnecting and testing every single pin of the CAN bus could prove to be extremely time and cost prohibitive
• Additionally, some type of memory saving device must be installed, lest the PCM and other controllers lose their memory and require reprogramming
• Control module ground circuits should be tested for continuity with battery ground
• These types of codes are frequently caused by defective or disconnected system grounds. An auxiliary ground cable can be helpful in diagnosing system ground discrepancies
• Compare your findings with the manufacturer’s referenced values and repair open or shorted circuits as required. It is often much more frugal to replace defective wiring rather than attempting to remove it from the complex web of wiring harnesses

Common Mistakes When Diagnosing The P0669 Code

• Make sure to replace the faulty control module
• The defective wiring or connectors within the CAN Bus harness should be replaced
• Replace any wiring, connectors, or other components related to the control module at fault that have gone bad
• The engine or transmission cables, wires, or straps should be properly secured or re-attached