| Transmission control module (TCM) -power input signal malfunction
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|Wiring, poor connection, TCM
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Table of Contents
- What Does Code P0880 Mean?
- What are the common causes of code P0880?
- What are the symptoms of code P0880?
- How do you troubleshoot code P0880?
- Codes Related to P0880
- Get Help with P0880
What Does Code P0880 Mean?
If your OBD-II equipped vehicle has stored a code P0880, it means that the PCM has detected a malfunction in the power (voltage) input signal circuit for the transmission control module (TCM).
In most cases, the TCM is integrated into a single housing with the PCM. Nevertheless, the section of the module which controls (automatic) transmission function may be powered up separately. In any case, the TCM is typically powered using switched (only present with the ignition switch in the ON, start, or run position) voltage. This circuit is normally equipped with a fuse, fusible link, and/or a relay. Frequently, the PCM and TCM are powered using the same relay albeit by separate circuits. Access to a reliable vehicle information source will yield necessary details of the TCM power circuit for the specific vehicle in question.
Each time the engine is started, the PCM performs a self-test of all controllers. If no acceptable TCM power input signal (battery voltage) is discovered, a code P0880 will be stored and a malfunction indicator lamp may be illuminated, In some models, the transmission controller will also enter limp-in mode if a code of this type is stored.
What are the common causes of code P0880?
- Defective PCM or TCM power relay
- Blown or corroded fuse
- Burnt fusible link
- Shorted or open TCM power input circuit
- Bad TCM/PCM or programming error
What are the symptoms of code P0880?
- Harsh or erratic shifting
- Engine may stall at idle
- Delayed transmission engagement
- Shift interlock function may be disabled
- Intermittent or total speedometer/odometer failure
- Other transmission control codes are likely
How do you troubleshoot code P0880?
A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a vehicle information source are some of the tools that will be required to successfully diagnose a P0880.
A good starting point in your diagnosis is checking all system fuses and fusible links. This can be done using the DVOM on the voltage setting. You will want to test the fuses with circuits loaded. Some fuses will appear normal until a load is placed on their respective circuit; at which point they will fail. This has been the cause of many “phantom malfunctions”. Consult your vehicle information source for fuse and fusible link locations. If all fuses are in working order, you may want to check TCM relay operation by swapping identical relays. Usually the horn relay, starter relay, fuel pump relay, air conditioning clutch relay, and controller relays are similar enough in design to swap for diagnostic purposes. This is a quick and easy method to discover relay failure but always make sure to put the relays back (in their original place) once you have arrived at a diagnosis. Obviously, you will want to replace failed fuses and relays as required.
Next, connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. Having this information written down may prove helpful as your diagnosis unfolds. Once you have it written down, clear the codes and test-drive the vehicle to see if the P0880 is reset.
At this point we are assuming that the fuses and relays are good. You will need to locate the PCM/TCM and the power input signal circuit using your vehicle information source. Unplug the connector from the PCM/TCM, place the ignition switch in the ON position, and probe the appropriate circuit with the positive test lead of the DVOM.
- If there is battery voltage present, suspect a defective PCM or a programming error.
- If there is no voltage present, suspect a broken wire or faulty ignition switch.
- If there is some voltage on the circuit, but it is significantly less than that of the battery, suspect a shorted or corroded power wire somewhere in the harness.
Codes Related to P0880
- P0700 Transmission Control System Malfunction
- P0701 Transmission Control System Range/Performance
- P0702 Transmission Control System Electrical
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