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DTC P2123 - Throttle Position 2 Sensor Circuit High🔗

Conditions for Setting DTC P2123🔗

  • Engine Running
  • Throttle Position 2 Sensor ≥ 4.9 volts
  • The above must be present for a period of 128 instances/cycles or greater to trigger DTC P2123

Diagnostic Steps🔗

Step Action Value(s) YES NO
1 - Key ON, Engine OFF
- Within VCM Live, open the TPS 2 DTC Maximum parameter, does the TPS sensor parameter display 0.1 volts or less?		 Go to Step 3 Go to Step 2
2 - Slowly depress the foot pedal while observing the TPS voltage parameter within VCM Live
- Does the TPS voltage ever fall below 0.2 volts?		 Go to Step 3 Intermittent Issue - Refer to Intermittent Diagnostics
3 - Key OFF
- Disconnect the TPS connector and jump the 5 volt reference cavity 1 & the TPS signal cavity 3 together at the TPS connector
- Key ON
- Does the TPS parameter within VCM Live display a voltage of 4.0 volts or greater?		 Go to Step 6 Go to Step 4
4 - Key OFF
- Disconnect the ECU harness connector "C"
- Using a DVOM check continuity between the TPS connector signal cavity 3 & the ECU connector "C" pin 25
- Do you have continuity between them?		 Go to Step 5 Repair the circuit as necessary, locate any wires that need to be repaired or replaced
5 - Replace the ECU
- Is the replacement complete?		 Go to Step 8 N/A
6 - Inspect the TPS wire harness connector terminals for corrosion or contamination
- Any issues found?		 Repair the circuit as necessary and fix any pins with corrosion or contamination Go to Step 7
7 - Replace the TPS
- Is the replacement complete?		 Go to Step 8 N/A
8 - Clear any DTC from the ECU
- Turn the ignition off and wait 30 seconds
- Start the engine and operate the engine to full operating temperature
- Observe the Check Engine Light on the Menu bar in VCM Live
- After operating the engine within the test parameters, check for any store codes
- Does the engine operate without any stored DTCs?		 System is now operational and ready to be tuned Contact HP Tuners Support