P2104 - THROTTLE ACTUATOR CONTROL SYSTEM - FORCED IDLE

Storing the P2104 OBD2 diagnostic code indicates that the vehicle’s main computer has found a malfunction and limits the Throttle Actuator Control system. This situation is known as the fault test mode. In this mode, the engine will not accelerate until the malfunction is corrected.

When the fail-safe mode is activated, the Powertrain Control Module (PCM) forces the TAC (Throttle Actuator Control) system to remain inactive. The malfunction may be directly related to the TAC System or may be due to abnormal voltages in some vehicle systems. Other error codes may appear along with the P2104 code.

• The Check Engine light turns on.
• The motor fails to start.
• Throttle response is low or none at all.
• Transmission shifts are not available.
• Other codes are displayed.

Reasons to set the P2104 OBDII trouble code:

• Possible motor overheating.
• Perhaps there are refrigerant leaks.
• The Exhaust Gas Recirculation (EGR) valve may not be working properly.
• The Mass Air Flow (MAF) sensor may be faulty.
• The automatic transmission may be damaged.
• Out-of-range voltages due to poor electrical connections.

To troubleshoot DTC P2104 OBD2, take into account the following steps:

• For a good diagnosis, consult the Technical Service Bulletins.
• Use an advanced scan tool to retrieve all trouble codes. If there are other codes, diagnose and repair them.
• Check the throttle actuator and related cables. Check for burnt, frayed wires or corroded connectors. Repair if necessary.