garajizOBD-II code · manufacturer-specific
P1637
Smart Alternator Faults Sensor/Circuit Malfunction
- System
- P1 — Powertrain (manufacturer-specific)
- Severity
- Moderate (3/5)
- Can I keep driving?
- Drive with caution
What does P1637 mean?
P1637 is defined as “Smart Alternator Faults Sensor/Circuit Malfunction”.
Drive gently and only as far as you need to; have it checked as soon as possible.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Jaguar: CAN Link ECM ABS Control Module Circuit Network
- Citroen, Diğer, Peugeot: Can Link ECM/ABSCM Circuit / Network Malfunction
- Volkswagen: Data Bus Powertrain Missing Message From Central Electronic Control
- Buick, Cadillac, Chevrolet, GM, GMC, Oldsmobile, Saturn: Generator L-Terminal Circuit
- BMW: Throttle Valve Position Control Control Deviation
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This page is general information; an exact diagnosis needs measurements and a technician’s check.