Pinpoint Test Y: Powertrain Control Module (Pcm) Read Only Memory (ROM) Failure

2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Pinpoint Test Y: Powertrain Control Module (Pcm) Read Only Memory (ROM) Failure
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.

Normal Operation and Fault Conditions 

Refer to the DTC Fault Trigger Conditions.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Condition
PCM P0601:00 Internal Control Module Memory Checksum Error: No Sub Type Information Sets when the PCM detects the central processor unit internal check returns an incorrect value.
PCM P062F:00 Internal Control Module EEPROM Error: No Sub Type Information Sets when the PCM detects the ROM is corrupt.

Possible Sources 

  • Aftermarket performance product
  • PCM relay control circuitry concern
  • PCM power relay
  • PCM calibration
  • PCM (12A650)

Visual Inspection and Pre-checks 

  • Reprogram or update the calibration. Reprogram the vehicle identification vehicle identification block. Check for other Diagnostic Trouble Codes (DTCs) or drive symptoms for further action. Make sure to check for aftermarket performance products before installing a new PCM. If it is necessary to install a new PCM, refer to Powertrain Control Module (PCM)  .

PINPOINT TESTS Y: POWERTRAIN CONTROL MODULE (PCM) READ ONLY MEMORY (ROM) FAILURE (Diesel)

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.