Aston Martin diagnostic trouble code
P0222: Throttle/Pedal Position Sensor B Circuit Low Input
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 P0222 means
Throttle/Pedal Position Sensor B Circuit Low Input
DB9 preliminary diagnostic manual · section 2-28
Manufacturer fault-analysis procedure
Manual fault definition
P0121/P0221 - TP sensor signal range or performance.
P0122/P0222 - The TP signal went below 0.17
volts during continuous testing.
P0123/P0223 - The TP signal went above 4.60
volts during continuous testing.
P0122/P0222 - The TP signal went below 0.17
volts during continuous testing.
P0123/P0223 - The TP signal went above 4.60
volts during continuous testing.
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
one of the above codes 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.
3. For low voltage readings, suspect a short circuit of
the sensor reference supply (nominal 5.0V supply
from primary PCM pin C0636-18 or secondary
PCM pin C2464-18) to ground or to TPRTN (primary PCM pin C0636-7 or secondary PCM pin
C2464-7).
Key off, check for short circuit between the lines
from Primary PCM pin C0636-18 to PCM pin
C0636-7. Also check from Secondary PCM pin
C2464-18 to PCM pin C2464-7. Also check for
short circuit to ground on the signal lines C0636-
18 and C2464-18. If any circuit fault is identified,
service the wiring as necessary and then go to
step 5
4. For high voltage readings (above 3.50 volts) suspect a short circuit in the sensor wiring from sensor reference supply (primary PCM pin C0636-18
or secondary PCM pin C2464-18 to the signal
line pins (Primary PCM pins C0636-19 and
C0636-29 or secondary PCM pins C2464-19 and
C2464-29), or internally within the potentiometer.
Key off, disconnect the TP sensor, key on. Measure the voltage between the sensor reference supply and TP signal lines, approximately 5.0 volts
should be present. If not, investigate and rectify
the problem in the reference supply or in the signal lines.
If approximately 5.0 volts is present, replace the
TP sensor.
5. Clear the fault code, run the drive cycle to ensure
that the problem is resolved.
Open the corresponding manual page for wiring diagrams and figures
one of the above codes 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.
3. For low voltage readings, suspect a short circuit of
the sensor reference supply (nominal 5.0V supply
from primary PCM pin C0636-18 or secondary
PCM pin C2464-18) to ground or to TPRTN (primary PCM pin C0636-7 or secondary PCM pin
C2464-7).
Key off, check for short circuit between the lines
from Primary PCM pin C0636-18 to PCM pin
C0636-7. Also check from Secondary PCM pin
C2464-18 to PCM pin C2464-7. Also check for
short circuit to ground on the signal lines C0636-
18 and C2464-18. If any circuit fault is identified,
service the wiring as necessary and then go to
step 5
4. For high voltage readings (above 3.50 volts) suspect a short circuit in the sensor wiring from sensor reference supply (primary PCM pin C0636-18
or secondary PCM pin C2464-18 to the signal
line pins (Primary PCM pins C0636-19 and
C0636-29 or secondary PCM pins C2464-19 and
C2464-29), or internally within the potentiometer.
Key off, disconnect the TP sensor, key on. Measure the voltage between the sensor reference supply and TP signal lines, approximately 5.0 volts
should be present. If not, investigate and rectify
the problem in the reference supply or in the signal lines.
If approximately 5.0 volts is present, replace the
TP sensor.
5. Clear the fault code, run the drive cycle to ensure
that the problem is resolved.