P0501 Vehicle speed sensor 1 performance

P0501 code

P0501 code - The Transmission Control Module (TCM) received information from the engine, anti lock brake system, and the electronic gear shift control modules over the CAN C bus. The CAN C bus is high speed communication bus that allows real time control capability between various controllers. Most messages are sent every 20 msec, this means critical information can be shared between multiple controllers almost instantaneously. The CAN C bus is a two wire bus with a CAN (+) and a CAN (-) circuit. To reduce the potential of radio and other electrical noise interference, the CAN Bus circuit wiring is manufactured using a twisted pair configuration within the electrical wiring harness.

Set condition the DTC will set if multipleABS wheel speed signals are invalid.

Possible causes P0501 code

- ABS DTCs present

- Transmission Control Module (TCM)

Diagnostic test P0501 code

Step 1. Check for DTCS U0001 CAN C Bus DTC or U0121 Lost Communication With Anti Lock Brake Module

With the scan tool, check DTCs.

Is DTC U0001 CAN C Bus DTC or U0121 Lost Communication With Anti Lock Brake Module set?

Yes, perform the diagnostic procedure for U0001 CAN Bus DTC first if it present.

No, go to step 2.

Step 2. Check for ABS DTCS

With the scan tool, read ABS DTCs.

Are there any ABS DTCs present?

Yes, refer to  Antilock Brake System (ABS) DTCs group and perform the appropriate diagnostic procedure.

No, using the schematics as aguide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuit. If no problems are found, replace and program the TCM in accordance with the service information.      

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