Transmission Control System Electrical (Shift Solenoid A)
Electrical issue with Shift Solenoid A in the transmission control system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The Transmission Control Module (TCM) detects a problem with the electrical circuit for Shift Solenoid A, potentially causing the vehicle to shift poorly or not at all. This usually means there's either a wiring problem or a bad solenoid.
What the computer is actually seeing
The TCM monitors solenoid A’s circuit for proper voltage and resistance. It expects 12V on the circuit when active and around 25-100 ohms of resistance on the solenoid itself. If the voltage is low or the resistance is out of range, this code is triggered.
What a healthy reading looks like
12V when solenoid is activated; resistance of 25-100 ohms for the solenoid.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the basics: Inspect the wiring and connectors going to shift solenoid A for damage, corrosion, or loose connections. Decision: If wiring is damaged, repair and clear code. If not, proceed to step 2.
- 22. Measure voltage at the shift solenoid A connector with the engine running. Expected reading is 12V when solenoid is commanded on. Decision: If no voltage is present, check TCM output and wiring. If 12V present, proceed to step 3.
- 33. Disconnect shift solenoid A and measure resistance across the solenoid terminals. Expect 25-100 ohms. Decision: If resistance is out of range, replace the solenoid. If in range, suspect a faulty TCM.
Common causes
- Faulty shift solenoid A
- Wiring issues or open circuits
- Poor connections at the solenoid or TCM
- Failed transmission control module (TCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive long distances. You may experience poor shifting or locking in a gear.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed.
Why does this code pair with others?
Transmission issues often stem from multiple causes, affecting solenoids, sensors, and the TCM.
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