P1623moderate severityPowertrain
Transmission Temp Pull-Up Resistor
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The pull-up resistor for the transmission temperature circuit is faulty. This affects accurate transmission temperature readings.
Symptoms
- Check engine light on
- Erratic temperature readings
- Abnormal shift behavior
Common causes
- Faulty pull-up resistor
- Bad transmission temp sensor
- Damaged circuit wiring
- Faulty control module
Diagnostic steps
- Scan for stored codes
- Check transmission temp sensor circuit
- Measure pull-up resistor value
- Inspect wiring and connectors
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