Invalid Data Received From Vehicle Speed Control Module 'A'
The vehicle's computer is not getting valid data from the speed control module.
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)
Your car's computer is asking the speed control module how fast the car is going, but the module is sending back bad info. This could be due to a wiring issue or a faulty module.
What the computer is actually seeing
The powertrain control module (PCM) detects an invalid signal from the vehicle speed control module 'A'. This could mean the signal voltage is outside the expected range (typically 0-5 volts for digital signals) or completely missing.
What a healthy reading looks like
Valid signals should be in the range of 0-5V with specific frequencies corresponding to vehicle speed (e.g., 1,000 RPM equates to approximately 5V at idle).
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 all related wiring and connectors for damage or corrosion. Repair as necessary. Decision: If nothing is found, proceed to step 2; if issues are found, fix them and retest.
- 22. Measure the voltage at the vehicle speed control module with the key on, engine off. Expected range is 0-5V when the module is functioning. Decision: If voltage is within range, proceed to step 3; if not, module may need replacement.
- 33. With the vehicle running, check the signal from the speed control module while monitoring the vehicle speed. Use a scan tool for real-time data. Decision: If the speed changes and is reflected in the signal, the module is functioning; if not, replace the module.
Common causes
- Faulty vehicle speed control module
- Wiring issues or damaged connectors
- Faulty or misconfigured PCM
- Open or shorted circuits in speed sensor wiring
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but expect potentially erratic speedometer readings and cruise control issues. Fix soon.
Will this code come back after I reset it?
If the underlying issue isn't fixed, yes, it will likely return.
What can cause this issue besides the speed control module?
Wiring problems and connection issues are often the cause, so check those thoroughly first.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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