Aston Martin diagnostic trouble code
P0553: Power Steering Pressure Sensor/Switch Circuit High 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: Not stated; DB9: MIL
What Aston Martin code P0553 means
Power Steering Pressure Sensor/Switch Circuit High Input
DB9 preliminary diagnostic manual · section 2-128
Manufacturer fault-analysis procedure
Manual fault definition
P0553 - Power steering pressure sensor - high input.
Test sequence and decision path
1. Connect the WDS and check that P0552 is
logged.
2. Disconnect the power steering pressure switch
connector (C2469). Switch on the ignition and
check for +5volts between harness connector
pins C2469 - 2 (+5 V) and C2469 - 1 (Signal
Return).
If +5v is present, shake/wiggle the harness from
the primary PCM to the pressure switch. Look for
any rise in the supply level due to an intermittent
short to the +12 volt lines.
Also check the other branches of the signal line
from splice 20 to the cabin and forward harnesses.
If no defect is identified, go to step 3
If any defect is identified, service the harness as
necessary. Reconnect all components and clear
the P0553 code. Run a KOER test and include
some lock to lock steering movements. If the test
is satisfactory with no repetition of the P0553
code, the problem is resolved.
3. Check the voltage level of the PSPT signal line
from C2469 - 3 at the pressure switch connector
to chassis ground.
Shake/wiggle the harness whilst checking for possible short circuit to a +12 volt supply.
If no short circuit is detected, replace the sensor.
Run a KOER test to ensure that the e problem is
resolved
If a short circuit is detected, service the harness as
necessary. Reconnect all components and clear
the P0553 code. Run a KOER test and include
some lock to lock steering movements. If the test
is satisfactory with no repetition of the P0553
code, the problem is resolved.
Open the corresponding manual page for wiring diagrams and figures
logged.
2. Disconnect the power steering pressure switch
connector (C2469). Switch on the ignition and
check for +5volts between harness connector
pins C2469 - 2 (+5 V) and C2469 - 1 (Signal
Return).
If +5v is present, shake/wiggle the harness from
the primary PCM to the pressure switch. Look for
any rise in the supply level due to an intermittent
short to the +12 volt lines.
Also check the other branches of the signal line
from splice 20 to the cabin and forward harnesses.
If no defect is identified, go to step 3
If any defect is identified, service the harness as
necessary. Reconnect all components and clear
the P0553 code. Run a KOER test and include
some lock to lock steering movements. If the test
is satisfactory with no repetition of the P0553
code, the problem is resolved.
3. Check the voltage level of the PSPT signal line
from C2469 - 3 at the pressure switch connector
to chassis ground.
Shake/wiggle the harness whilst checking for possible short circuit to a +12 volt supply.
If no short circuit is detected, replace the sensor.
Run a KOER test to ensure that the e problem is
resolved
If a short circuit is detected, service the harness as
necessary. Reconnect all components and clear
the P0553 code. Run a KOER test and include
some lock to lock steering movements. If the test
is satisfactory with no repetition of the P0553
code, the problem is resolved.