Technical Description of OBD-II Trouble Code
Performance Issue with Internal Control Module Brake Signal
What does that signify?
This generic powertrain diagnostic trouble code (DTC) is commonly found in many OBD-II vehicles, including those from Dodge, Ram (Cummins), Ford, Chrysler, and others.
When code P061E is stored, it indicates that the powertrain control module (PCM) has detected an internal performance error in the brake signal circuit. Other controllers may also detect an internal PCM performance error (with the engine RPM monitoring system) and contribute to the storage of code P061E.
Internal control module monitoring processors are responsible for various self-test duties of the controllers and overall accountability of the internal control module. The PCM and other related controllers constantly monitor the input and output signals of the engine air mass calculation system through self-tests. The brake signal circuit is also subject to interaction with the transmission control module (TCM), traction control module (TCSM), and other controllers.
The brake signal circuit (also known as the stop lamp circuit) is monitored by the PCM and other controllers using input signals from the brake pedal sensor. This circuit is integral to several control systems used in OBD-II vehicles, including the cruise control system and the transmission torque converter lockup system. The PCM and other controllers receive input signals from the stop lamp switch and use these inputs to activate and deactivate various functions accordingly. Brake signal inputs are typically limited to distinctions of either ON or OFF.
Whenever the ignition is on and the PCM is energized, self-tests for the internal engine brake signal circuit are initiated. In addition to running internal controller self-tests, the controller area network (CAN) also compares signals from each individual module to ensure that all controllers are functioning properly. These tests are performed simultaneously.
If the PCM detects an internal error in the brake signal circuit, code P061E will be stored and a malfunction indicator lamp (MIL) may illuminate. Multiple ignition cycles (with a failure) may be required for MIL illumination.
Photo of a PCM with the cover removed:
What is the severity of this DTC?
Codes for internal control module processors should be considered severe. A stored code P061E could result in erratic operation of the transmission torque converter lockup or inoperative cruise control (speed control).
What are some of the symptoms of the code?
Symptoms of a P061E trouble code may include:
What are some of the common causes of the code?
Causes for this code may include:
What are some P061E troubleshooting steps?
Even for the most experienced and well-equipped professional technician, diagnosing a code P061E can prove to be quite challenging. There is also the issue of reprogramming. Without the necessary reprogramming equipment, it will be impossible to replace a defective controller and complete a successful repair.
If there are ECM/PCM power supply codes present, they will obviously need to be rectified before attempting to diagnose a P061E. Also, if brake lamp switch/signal codes are present, these must be diagnosed and repaired first.
Follow the manufacturer’s recommendations for testing brake lamp switches. Replace failed components as required.
There are several preliminary tests that can be performed prior to declaring an individual controller defective. A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information will be required. An oscilloscope may also prove to be helpful.
Connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. It is important to write this information down, just in case the code proves to be intermittent. After recording all pertinent information, clear the codes and test drive the vehicle until the code is reset or the PCM enters readiness mode. If the PCM enters readiness mode, the code is intermittent and will be more difficult to diagnose. The condition that caused the P061E to be stored may even need to worsen before a diagnosis can be made. If the code is reset, continue with this short list of preliminary tests.
When attempting to diagnose a P061E, information may be the most valuable tool. Search your vehicle information source for technical service bulletins (TSB) that are related to the stored code, vehicle (year, make, model, and engine), and exhibited symptoms. If you find the appropriate TSB, it may provide diagnostic information that will greatly assist you.
Use your source of vehicle information to obtain connector face views, connector pin-out charts, component locators, wiring diagrams, and diagnostic flow charts that are relevant to the code and vehicle in question.
Use the DVOM to test controller power supply fuses and relays. Test and replace blown fuses as required. Fuses should be tested with the circuit loaded.
If all fuses and relays appear to be functioning as intended, visually inspect the wiring and harnesses related to the controllers. Also, check the chassis and engine ground junctions. Use your vehicle information source to obtain ground locations for the related circuits. Use the DVOM to test ground integrity.
Visually inspect the system controllers for signs of water, heat, or collision damage. Any controller that is damaged, especially by water, should be considered defective.
If the controller power and ground circuits are intact, suspect a defective controller or a controller programming error. Controller replacement will require reprogramming. In some cases, reprogrammed controllers may be purchased through aftermarket sources. Other vehicles/controllers will require on-board reprogramming that can only be done through a dealership or other qualified source.
