P1850high severityPowertrain
Brake Band Apply Solenoid Circuit
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
A fault was detected in the brake band apply solenoid circuit inside the transmission. This can cause shift and engagement problems.
Symptoms
- Harsh or slipping shifts
- Transmission warning light
- Limp mode
Common causes
- Faulty brake band apply solenoid
- Internal wiring or harness fault
- Poor connector contact
- Faulty TCM driver
Diagnostic steps
- Scan for solenoid codes
- Test solenoid resistance and operation
- Inspect internal harness and connector
- Replace solenoid or repair wiring
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