What does it mean?
P1752 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Transmission Shift Solenoid 'B' Circuit Malfunction .
Symptoms
- MIL (check engine lamp) on together with a transmission warning lamp
- Missing gear, wrong gear or a harsh bang during one particular shift
- Limp mode with the transmission locked in a single ratio
- Shift quality that changes noticeably as the fluid warms up
- Blown transmission fuse in cases where the circuit is fully shorted
Likely causes
- Shorted solenoid B winding, internally or to the transmission case
- Short to ground on the solenoid drive wire where the internal harness rubs
- Open circuit or a high resistance joint in the same drive wire
- Corroded, wet or oil filled case connector with damaged terminals
- Blown fuse or interrupted supply to the solenoid pack
- Wrong solenoid fitted during a previous repair, with the wrong resistance
- Module output driver shorted, checked only after the solenoid is verified
How to fix it
- Check the transmission fuses and system voltage first
- Measure shift solenoid B resistance at the case connector and compare with the other solenoids
- With the solenoid unplugged, test its drive circuit for a short to ground and continuity to the module
- Check insulation between the solenoid terminal and the transmission case
- Command the solenoid with a scan tool and watch for the expected ratio change
- Inspect the internal harness and case connector for chafing and fluid ingress
- Replace the solenoid or repair the internal harness, then confirm all shifts on a road test