A 2019 Ford F-250 would not crank after three months parked. The owner had found evidence of mice and observed a problem around the powertrain-control relay circuit.
How the investigation developed
Initial checks did not locate obvious damaged wiring. A later workshop visit raised suspicion of the computer, but that was not a confirmed diagnosis. The owner then took the vehicle to a dealer.
What the author actually confirmed
In an April 2026 answer, Cheery reported that the dealer found wires damaged by mice. The short follow-up does not identify the exact wire or document the completed repair. We therefore describe a reported finding, not a verified repair procedure.
Before approving a costly replacement
Ask what measurement supports a module diagnosis and whether its supply, ground and relevant wiring were checked. Give the technician the storage history and evidence of pests. Do not reproduce the relay-bypass experiment described in the original discussion: forcing a circuit on can defeat normal controls. Arrange professional diagnosis or recovery when normal starting operation is unavailable.
Author follow-up · not independently verified
For information, not a diagnosis or repair instruction. A reported result may not apply to your car. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This is an editorial interpretation of a public discussion. Replies, votes and an accepted answer do not prove a diagnosis. An author-reported finding or repair has not been independently verified by AI4Car. Illustrations are conceptual. Read the content limitations.
Credits & reuse
AI-assisted adaptation by AI4Car of the contributions below on Motor Vehicle Maintenance & Repair Stack Exchange. We shortened and reorganized the discussion, paraphrased its text and added educational context. These are reported experiences, not independently verified repairs. The contributors do not endorse AI4Car.
- Question: No start no crank: Powertrain control module relayBy Cheery · CC BY-SA 4.0
- Answer: No start no crank: Powertrain control module relayBy Cheery · CC BY-SA 4.0
This adapted article text, including AI4Car’s additions, is available under CC BY-SA 4.0. Reuse is permitted under that license with attribution, an indication of changes and ShareAlike. This notice excludes the separate illustration, site design and user comments. The source revision history remains available at Stack Exchange.
Illustration: AI-generated for AI4Car; a generic conceptual view, not a photograph of the reported vehicle or a manufacturer’s diagram. Content and licensing policy.
Was this useful?
Discussion
Share what you checked, what changed, and which vehicle you drive. Up to 10 comments and replies per account in 24 hours.
Loading discussion…