Aston Martin diagnostic trouble code
P0124: Throttle/Pedal Position Sensor A Intermittent
Use this reference to understand the recorded condition, confirm the available V8 Vantage or DB9 manual coverage, and follow the documented diagnostic checks before replacing parts.
- Code family
- Powertrain
- Vehicle system
- Fuel and air
- Manual coverage
- V8 Vantage, DB9
- Warning-lamp status
- V8 Vantage: MIL; DB9: MIL
What Aston Martin code P0124 means
Throttle/Pedal Position Sensor A Intermittent
DB9 preliminary diagnostic manual · section 2-30
Manufacturer fault-analysis procedure
Manual fault definition
P0124 - The TP signal intermittent.
Cautions and notes
CAUTION: This code may be generated in the
Primary or Secondary Powertrain Control Module
(PCM). Check that you are working on the correct
half of the engine.
Primary or Secondary Powertrain Control Module
(PCM). Check that you are working on the correct
half of the engine.
Test sequence and decision path
1. Connect the WDS or scan tool and confirm that
P0124 is present.
2. Set the datalogger to monitor all throttle potentiometer signals. Run the engine and note the voltage of the throttle potentiometer signal. The
voltage should be in the range 0.6 - 4.50 volts.
Identify the potentiometer which is generating the
out of range signal. Also look for any irregularities
in the signal traces.
The signals should vary progressively with throttle
opening and closing.
If the voltage is not in range, go to step 3.
If the voltage is in range, shake/wiggle the engine
harness whilst monitoring the TP signals to detect
any intermittent connection. Service any identified poor connections and retest to ensure that
the problem is resolved.
3. Key off, disconnect the TP sensor, key on. Measure the voltage between the sensor reference supply - Bank A pin C2465-3 or Bank B pin C2466-3
and chassis ground. Repeat the measurement
from Bank A pin C2465-3 or Bank B pin C2466-3
to TPRTN Bank A pin C2465-2 or Bank B pin
C2466-2, approximately 5.0 volts should be
present on both measurements.
If +5 volts is measured, go to step 5.
If +5 volts is not present, go to step 4.
4. Fit the PCM breakout box and check continuity of
the +5 volt supply and TP return lines from the
throttle body connector to the PCM connector.
Service the wiring as necessary. Clear the P0124
code and run a KOER test to ensure that the problem is resolved.
5. Install the breakout box to the affected PCM.
Check the continuity of the TP signal lines
between the following points:
Primary Throttle Assembly
C2465-5 to C0636-19
C2465-6 to C0636-29
Secondary Throttle Assembly
C2466-5 to C2464-19
C2466-6 to C2464-29
If necessary, shake/wiggle the throttle section of
the harness to locate the circuit fault.
Service the harness as necessary and reconnect
all components.
6. Clear the P0124 code, run the drive cycle to
ensure that the problem is resolved.
Open the corresponding manual page for wiring diagrams and figures
P0124 is present.
2. Set the datalogger to monitor all throttle potentiometer signals. Run the engine and note the voltage of the throttle potentiometer signal. The
voltage should be in the range 0.6 - 4.50 volts.
Identify the potentiometer which is generating the
out of range signal. Also look for any irregularities
in the signal traces.
The signals should vary progressively with throttle
opening and closing.
If the voltage is not in range, go to step 3.
If the voltage is in range, shake/wiggle the engine
harness whilst monitoring the TP signals to detect
any intermittent connection. Service any identified poor connections and retest to ensure that
the problem is resolved.
3. Key off, disconnect the TP sensor, key on. Measure the voltage between the sensor reference supply - Bank A pin C2465-3 or Bank B pin C2466-3
and chassis ground. Repeat the measurement
from Bank A pin C2465-3 or Bank B pin C2466-3
to TPRTN Bank A pin C2465-2 or Bank B pin
C2466-2, approximately 5.0 volts should be
present on both measurements.
If +5 volts is measured, go to step 5.
If +5 volts is not present, go to step 4.
4. Fit the PCM breakout box and check continuity of
the +5 volt supply and TP return lines from the
throttle body connector to the PCM connector.
Service the wiring as necessary. Clear the P0124
code and run a KOER test to ensure that the problem is resolved.
5. Install the breakout box to the affected PCM.
Check the continuity of the TP signal lines
between the following points:
Primary Throttle Assembly
C2465-5 to C0636-19
C2465-6 to C0636-29
Secondary Throttle Assembly
C2466-5 to C2464-19
C2466-6 to C2464-29
If necessary, shake/wiggle the throttle section of
the harness to locate the circuit fault.
Service the harness as necessary and reconnect
all components.
6. Clear the P0124 code, run the drive cycle to
ensure that the problem is resolved.