P1456 Fuel Tank Pressure Sensor Circuit Low
August 23, 2018
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P1456 code - The Powertrain Control Module (PCM) detects that the fuel tank pressure sensor (FTP) input voltage is below the minimum acceptable value. One trip fault. Three good trips to turn off the MIL.
- 5 Volt supply circuit short to ground
- FTP sensor signal circuit shorted to ground
- FTP sensor signal circuit shorted to the sensor ground circuit
- Fuel tank pressure sensor (FTP)
- Powertrain Control Module (PCM)
Turn the ignition on, with the scan tool read DTCs. Diagnose and repair any system voltage or 5 volt sensor reference DTCs before continuing with this test.
Does the scan tool display this DTC as active?
Yes, go to step 2.
No, perform the PCM intermittent condition.
Step 2. Check the 5 volt supply circuit voltage
Turn the ignition off, disconnect the FTP sensor harness connector. Turn the ignition on, measure the voltage on the 5-volt supply circuit at the FTP sensor harness connector.
Is the voltage between 4.8 and 5.2 volts?
Yes, go to step 3.
No, repair the 5-volt supply circuit for an open circuit or short to ground.
Step 3. Check the FTP sensor
With the scan tool view DTCs. The P1457 FUEL TANK PRESSURE CIRCUIT HIGH should be active or pending with the connector disconnected.
Does the scan tool display as described above ?
Yes, verify that is good pin to terminal contact in the FTP sensor and Powertrain Control Module (PCM) connectors. Replace the FTP sensor if no problems were found with the connectors.
No, go to step 4.
Step 4. Check the FTP signal circuit for a short to ground
Turn the ignition off, disconnect the PCM harness connector. Measure the resistance between ground and the FTP sensor harness connector.
Is the resistance below 3.0 Ohms?
Yes, repair the short to ground in the FTP sensor signal circuit.
No, go to step 5.
Step 5. Check for the FTP sensor signal circuit shorted to the FTP sensor return circuit
Measure the resistance between the FTP sensor signal circuit and the FTP sensor return circuit at the FTP sensor harness connector.
Is the resistance below 3.0 Ohms?
Yes, repair the short between the FTP sensor signal circuit and the FTP sensor return circuit.
No, go to step 6.
Step 6. Check related PCM and component connections
Possible causes P1456 code
- 5 Volt supply circuit open/high resistance- 5 Volt supply circuit short to ground
- FTP sensor signal circuit shorted to ground
- FTP sensor signal circuit shorted to the sensor ground circuit
- Fuel tank pressure sensor (FTP)
- Powertrain Control Module (PCM)
Diagnostic Test P1456 code
Step 1. Active DTCTurn the ignition on, with the scan tool read DTCs. Diagnose and repair any system voltage or 5 volt sensor reference DTCs before continuing with this test.
Does the scan tool display this DTC as active?
Yes, go to step 2.
No, perform the PCM intermittent condition.
Step 2. Check the 5 volt supply circuit voltage
Turn the ignition off, disconnect the FTP sensor harness connector. Turn the ignition on, measure the voltage on the 5-volt supply circuit at the FTP sensor harness connector.
Is the voltage between 4.8 and 5.2 volts?
Yes, go to step 3.
No, repair the 5-volt supply circuit for an open circuit or short to ground.
Step 3. Check the FTP sensor
With the scan tool view DTCs. The P1457 FUEL TANK PRESSURE CIRCUIT HIGH should be active or pending with the connector disconnected.
Does the scan tool display as described above ?
Yes, verify that is good pin to terminal contact in the FTP sensor and Powertrain Control Module (PCM) connectors. Replace the FTP sensor if no problems were found with the connectors.
No, go to step 4.
Step 4. Check the FTP signal circuit for a short to ground
Turn the ignition off, disconnect the PCM harness connector. Measure the resistance between ground and the FTP sensor harness connector.
Is the resistance below 3.0 Ohms?
Yes, repair the short to ground in the FTP sensor signal circuit.
No, go to step 5.
Step 5. Check for the FTP sensor signal circuit shorted to the FTP sensor return circuit
Measure the resistance between the FTP sensor signal circuit and the FTP sensor return circuit at the FTP sensor harness connector.
Is the resistance below 3.0 Ohms?
Yes, repair the short between the FTP sensor signal circuit and the FTP sensor return circuit.
No, go to step 6.
Step 6. Check related PCM and component connections
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