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 MANUALSBMW2011128I CONVERTIBLE (E88) L6-3.0L (N51)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP2123
2011 BMW 128i Convertible (E88) L6-3.0L (N51)
P2123
2011 BMW 128i Convertible (E88) L6-3.0L (N51)SECTION P2123
2D1B - P2123
Information saved in
DME
Fault code
2D1B - P2123
Fault text
Accelerator pedal module, pedal-position sensor, signal 1
Fault description
Throttle/Pedal Position Sensor/Switch 'D' Circuit High
Condition for fault identification
Test condition:
Pedal-position sensor monitor
No fault code currently registered
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system >= 10 V
Condition for fault memory entry
0.02 sec.
Action in service
1) Perform electrical check on sensor wire and power-supply
wires
2) Visual inspection of plug-in contacts (on component and
DME ends) 3) Replace PWG
Fault effect and breakdown warning
Driver information
Warning light:
CC status report: Reduced engine power!
EML ON restricted PW gradient and PW limit via rpm
Service instruction
none
Information saved in
DME
Fault code
2D1B - P2123
Fault text
Accelerator pedal module, pedal-position sensor, signal 1
Fault description
Throttle/Pedal Position Sensor/Switch 'D' Circuit High
Condition for fault identification
Test condition:
Pedal-position sensor monitor
No fault code currently registered
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system >= 10 V
Condition for fault memory entry
0.02 sec.
Action in service
1) Perform electrical check on sensor wire and power-supply
wires
2) Visual inspection of plug-in contacts (on component and
DME ends) 3) Replace PWG
Fault effect and breakdown warning
Driver information
Warning light:
CC status report: Reduced engine power!
EML ON restricted PW gradient and PW limit via rpm
Service instruction
none
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.