DTC P0A11 (1.5 L Engine) (2020 2021)

DTC P0A11  : DC-DC Converter Activation Circuit Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Test-drive the vehicle under the auto idle stop system operating condition, and stop the engine using auto idle stop .

   -5. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   P0A11 DC-DC Converter Activation Circuit Malfunction

   Is DTC P0A11 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot .

2. Determine possible failure area (Open in DCDC STS line, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Disconnect the following connector.

   PCM connector A (50P)

   -4. Exit the SCS mode with the HDS.

   -5. Turn the vehicle to the ON mode.

   -6. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	PCM connector A (50P): disconnected
   Test point 1	PCM connector A (50P) No. 14
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   Go to step 4.

   NO 

   Go to step 3.

3. Open wire check (DCDC STS line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   DC-DC converter connector A (3P)

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector A (50P): disconnected
   	DC-DC converter connector A (3P): disconnected
   Test point 1	DC-DC converter connector A (3P) (female terminals) No. 2:
   Test point 2	PCM connector A (50P) No. 14

   Courtesy of HONDA, U.S.A., INC.

   Is there 1.0 Ω or less?

   YES 

   Replace the DC-DC converter .

   NO 

   Repair an open in the DCDC STS wire between the PCM (A14) and the DC-DC converter.

4. Shorted wire check (DCDC STS line to power)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   DC-DC converter connector A (3P)

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	PCM connector A (50P): disconnected
   	DC-DC converter connector A (3P): disconnected
   Test point 1	DC-DC converter connector A (3P) (female terminals) No. 2:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5 V or more?

   YES 

   Repair a short to power in the DCDC STS wire between the PCM (A14) and the DC-DC converter.

   NO 

   The DCDC STS wire is OK. Replace the DC-DC converter . If DTC P0A11 was indicated after the DC-DC converter was replaced, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM .