P0976Shift Solenoid B Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Low-voltage fault, normally a ground short, in the control circuit of shift solenoid B. On GM six-speeds SS B is the mode 3 multiplex valve; the 2016 table sets P0976 after 1.2 of 1.5 s without lighting the MIL, while the Saab 9-4X 6T70 version needs 2 s, is Type B and raises line pressure. Ford uses it for SSB short to ground, with P0755 for an open; on the 2023 Super Duty diesel SSB is fed by solenoid supply TSPC2, so a P2669 supply fault disables this check. GM's Allison 1000 merges ground short and open into it in 2016, but from 2022 reports opens as P097B and keeps P0976 for ground faults found by an intrusive test (120 ms, MIL after one trip). High side is P0977.
- What you may notice
- Warning light or stored code, on some GM six-speeds without MIL
- Firm shifts due to raised line pressure
- Gears missing or limp mode
- Likely causes
- LikelySolenoid B control wire shorted to ground or housing
- PossibleInternal short in solenoid B or its valve body assembly
- PossibleMoisture or debris bridging pins at the connector
- RareFaulty driver in the transmission control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.