Aston Martin diagnostic trouble code
P0107: Manifold Absolute Pressure/BARO Sensor 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 P0107 means
Manifold Absolute Pressure/BARO Sensor Low Input
DB9 preliminary diagnostic manual · section 2-16
Manufacturer fault-analysis procedure
Manual fault definition
P0107 - The barometric pressure signal went below 2.4 volts during normal engine running.
Cautions and notes
CAUTION: The barometric pressure signal is
input only into the Primary PCM. Check that you
are working on the correct half of the engine.
input only into the Primary 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. Check that fault
code P0107 is present.
2. Using WDS, monitor the BAP signal. If the signal
level is not within the range 2.45 - 4.8 volts, go to
step 3. If the signal level is within the range 2.45 -
4.8 volts, the fault is not currently present. Treat
this as a possible intermittent problem.
3. Switch off the ignition. Disconnect C0188 at the
barometric pressure sensor. Connect a voltmeter
across pins 1 and 2 of the harness connector.
Switch on the ignition.
If +5 volts is measured, the BVREF and Signal
return lines are good. go to step 4.
If 0 volts is measured, go to step 5.
4. Check continuity of the signal line from sensor
connector pin 3 to Primary PCM connector
C0634-36.
If continuity is good, Substitute a good sensor.
Clear the P0107 code and run a KOER test to
ensure that the problem is resolved. If the problem recurs, change both PCMs.
If continuity is poor, Service the signal line wiring
as necessary. Clear the P0107 code and run a
KOER test to ensure that the problem is resolved.
5. Connect the breakout box to the primary PCM.
Switch on the ignition and measure for +5VDC
from C0634-40 to chassis ground.
If +5 volts is measured, the BVREF signal is good.
There is an open circuit in the BVREF or Signal
return lines to the barometric pressure sensor.
Service the wiring as necessary. Clear the P0107
code and run a KOER test to ensure that the problem is resolved.
Open the corresponding manual page for wiring diagrams and figures
code P0107 is present.
2. Using WDS, monitor the BAP signal. If the signal
level is not within the range 2.45 - 4.8 volts, go to
step 3. If the signal level is within the range 2.45 -
4.8 volts, the fault is not currently present. Treat
this as a possible intermittent problem.
3. Switch off the ignition. Disconnect C0188 at the
barometric pressure sensor. Connect a voltmeter
across pins 1 and 2 of the harness connector.
Switch on the ignition.
If +5 volts is measured, the BVREF and Signal
return lines are good. go to step 4.
If 0 volts is measured, go to step 5.
4. Check continuity of the signal line from sensor
connector pin 3 to Primary PCM connector
C0634-36.
If continuity is good, Substitute a good sensor.
Clear the P0107 code and run a KOER test to
ensure that the problem is resolved. If the problem recurs, change both PCMs.
If continuity is poor, Service the signal line wiring
as necessary. Clear the P0107 code and run a
KOER test to ensure that the problem is resolved.
5. Connect the breakout box to the primary PCM.
Switch on the ignition and measure for +5VDC
from C0634-40 to chassis ground.
If +5 volts is measured, the BVREF signal is good.
There is an open circuit in the BVREF or Signal
return lines to the barometric pressure sensor.
Service the wiring as necessary. Clear the P0107
code and run a KOER test to ensure that the problem is resolved.