2017 Subaru BRZ Limited, Automatic TransFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

DTC Code Detection Item DTC Output Confirmation Operation See
B2271 [IGN fuse blown-out or IGN circuit failure] Turn the engine switch on (IG). DTC B2271 IGN fuse blown or IGN circuit fault 
B2274 [ACC circuit abnormal] Wait 10 seconds after turning the engine switch on (ACC) or on (IG), and then wait another 10 seconds after turning the engine switch off. DTC B2274 ACC circuit abnormal 
B2275 [STSW circuit abnormal] Start the engine. DTC B2275 STSW circuit abnormal 
B2276 [ACCR signal abnormal] Start the engine. DTC B2276 ACCR signal abnormal 
B2277 [Submerging circuit abnormal] Submerging circuit monitor result = ON DTC B2277 Submerging circuit abnormal 
B2282 [Vehicle speed signal abnormal] Drive the vehicle for 20 seconds at a vehicle speed of 25 km/h (16MPH) or more, and then drive the vehicle at a vehicle speed of less than 5 km/h {3MPH} for 20 seconds. Inspection steps 
B2283 [Vehicle speed sensor abnormal detection] In IG ON, any of the following conditions is established.
  • Direct connection vehicle speed pulse showing 50 km/h or more continues for 10 seconds, then the CAN and direct connection speed pulses both turn to 0 km/h within 1 second.
  • In an AT vehicle, CAN and the direct connection show 0 km/h, the engine speed (according to the direct connection) is 2000 r/min or more, the shift lever is not in P or N, and ACCR is not in LOW level for 300 seconds.
  • In an MT vehicle, CAN and the direct connection show 0 km/h, the engine speed (according to the direct connection) is 2000 r/min or more, the N position for the shift lever is OFF, the clutch switch is OFF, and ACCR is in the LOW level for 300 seconds.
 Inspection steps 
B2284 [Brake Signal (Cable-Information does not match to BEAN-Information)] Connect the cable to the negative (-) battery terminal, release the brake pedal and wait 20 seconds or more. Then depress the brake pedal for 20 seconds or more. DTC B2284 Brake Signal (Cable-Information does not match to BEAN-Information) 
B2285 [Steering lock position signal abnormal] Disconnect the cable from the negative (-) battery terminal, wait 30 seconds and then reconnect the cable to the negative (-) battery terminal. Wait 40 seconds or more with the engine switch off (with the steering wheel locked), then turn the engine switch on (ACC) (with the steering wheel unlocked) and wait 40 seconds or more. DTC B2285 Steering lock position signal abnormal 
B2286 [Run able Signal (Cable-Information does not match to BEAN-Information)] Disconnect the cable from the negative (-) battery terminal, wait 30 seconds and reconnect the cable to the negative (-) battery terminal. Wait 20 seconds or more with the engine switch off, then start the engine and maintain an engine speed of 1000 r/min or more for 20 seconds or more after starting the engine. DTC B2286 Run able Signal (Cable-Information does not match to BEAN-Information) 
U0073 [Control Module Communication Bus "A" Off] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0100 [Lost Communication With ECM/PCM "A"] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0101 [Lost Communication With TCM] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0122 [Lost Communication With Vehicle Dynamics Control Module] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0140 [Lost Communication With Body Control Module] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0155 [Lost Communication With Instrument Panel Cluster (IPC) Control Module] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0401 [Invalid Data Received From ECM/PCM "A"] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
U0422 [Invalid Data Received From Body Control Module] 10 or more seconds have passed after IG ON DTC U0073 Control Module Communication Bus "A" off; DTC U0100 Lost Communication With ECM/PCM "A"; DTC U0101 Lost Communication With TCM; DTC U0122 Lost Communication With Vehicle Dynamics Control Module; DTC U0140 Lost Communication With Body Control Module; DTC U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0401 Invalid Data Received From ECM/PCM "A"; DTC U0422 Invalid Data Received From Body Control Module 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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