Symptoms of P0701
Depending on the vehicle, symptoms related to DTC P0701 may range from an illuminated MIL, with no drivability issues, to serious drivability issues.
Depending on failsafe design, some vehicles may revert to hydraulic function and shift more or less as expected, while others may drop certain gears, such as being unable to shift out of “L” to upper gears, or running only in 2nd gear. Some vehicles may be difficult to start, act like they’re misfiring, and may even stall when coming to a stop.
In any case, with the MIL illuminated, the ECM is automatically put in “limp-home mode,” enabling you to get home, but fuel economy and drivability will suffer. Immediate diagnosis and repair will be necessary.
Troubleshooting P0701
DTC P0701 is most often linked to one of two things: Electrical Failure or TCM Failure. First, make sure that both the ECM and TCM have good power and ground connections.
- If the TCM is a separate module from the ECM
- Check the wiring harness between the ECM and TCM. This may take some time, but there is likely an open circuit or short circuit between them. Look for obvious damage, such as crushed wires, rodent damage, or road debris damage.
- Check the connectors at the ECM and TCM. Look for broken or bent pins, which would cause open circuits or short circuits. Also look for corrosion or water entry, which could cause similar problems.
- Barring electrical problems, you likely have a TCM failure, which would require a reflash, if applicable, or replacement of the unit.
- If the TCM and ECM are in the same unit, then an electrical fault is essentially a module fault, which would require a reflash, if applicable, or replacement of the unit. Again, look for broken or bent pins, corrosion, water entry, or damage, any of which could cause this type of fault.
DTC P0701 may also simply refer to another fault in the system, so scan for additional related transmission control system codes for further diagnosis.
Common Causes of P0701
Depending on year, make, and model, DTC P0701 may have number of causes. Here are some of the most common.
- Wiring Harness or Connectors – Damage and corrosion are the two leading causes of TCM faults. A broken connector or compromised weather pack can easily allow water entry or poor connection.
- Aftermarket Installations – Inadvertently tapping into a critical circuit may cause unwanted interference in ECM / TCM communication.
Codes Related to P0701
If the ECM shows DTC
P0701 stored, look for other TCM-related codes to aid in your diagnosis. You may find:
- P0613 TCM Processor
- P0614 ECM/TCM Incompatible
- P0706 Transmission Range Sensor Circuit Range/Performance
- U0101 Lost Communication With Transmission Control Module
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