Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLVO1998S70 L5-2.4L VIN 55 B5254SREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSAT / DTC CODES (TRANSMISSION CONTROL MODULE)AT-331 LOCK-UP SOLENOID SLTROUBLE CODE CONDITIONS
1998 Volvo S70 L5-2.4L VIN 55 B5254S
Trouble Code Conditions
1998 Volvo S70 L5-2.4L VIN 55 B5254SSECTION Trouble Code Conditions
SPECIAL TOOLS
Volvo scan tool No. 998 8686, or equivalent
CONDITION
Lock-up solenoid SL controls the transmission lock-up function. Solenoid SL operates when battery voltage is applied from the Transmission Control Module (TCM) and is activated during different driving conditions depending on road speed, throttle position and the driving mode selected. Diagnostic Trouble Code (DTC) AT-331 is posted if the TCM registers a short-circuit to supply voltage in the solenoid SL circuit when the solenoid should not be activated. Solenoid SL is probably permanently activated.
SUBSTITUTE VALUE
The TCM "Emergency mode 1" program has been initiated.
POSSIBLE SOURCE
Short-circuit to supply voltage in the signal cable.
FAULT SYMPTOM(S)
- Since the solenoid is permanently activated the lock-up function is permanently engaged on 2nd, 3rd and 4th gears.
- Harsh shifting and engine braking on 2nd, 3rd and 4th gears.
- Start fault-tracing at short-circuit to supply. Short Circuit To Supply
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.