Diagnostic trouble code information

Condition 

Fig 1: Identifying Transmission Control Module (TCM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The automatic transmission checks that lock-up is not engaged or slips by comparing the RPM signal from the transmission speed (RPM) sensor to the engine speed. The signals must then show the same calculated speed (RPM). If the control module detects that the engine speed (RPM) signals do not correspond with the programmed values, it means that lock-up is slipping or does not engage in the locked position. The diagnostic trouble code (DTC) is stored.

Substitute Value 

• Control unit help program "Emergency mode I" has started to work.

Possible Source 

• Poor quality transmission fluid.
• Water in the oil.
• Contact resistance in the connectors.
• Gear shift solenoid S4 is jammed in OFF position.
• Gear shift solenoid SLU is jammed in OFF position.
• Mechanical fault in the gearbox.

Fault symptom[s] 

• Orange general warning lamp is on.
• Malfunction indicator light (MIL) is on.
• No lock up function.
• Rough gear shifts.