Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Dodge and Ram ProMaster 1500FACTORY OEM SERVICE PROCEDURE
DTC Index: HVAC
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B1902-11 | FRONT MODE DOOR 1 ACTUATOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1902-12 | FRONT MODE DOOR 1 ACTUATOR CONTROL-CIRCUIT SHORT TO BATTERY |
| B1902-77 | FRONT MODE DOOR 1 CONTROL-COMMANDED POSITION NOT REACHABLE |
| B1906-11 | MAIN LEFT TEMPERATURE DOOR 1 ACTUATOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1906-12 | MAIN LEFT TEMPERATURE DOOR 1 ACTUATOR CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1906-77 | MAIN LEFT TEMPERATURE DOOR 1-COMMANDED POSITION NOT REACHABLE |
| B1909-11 | RECIRCULATION DOOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1909-12 | RECIRCULATION DOOR CONTROL-CIRCUIT SHORT TO BATTERY |
| B1909-77 | RECIRCULATION DOOR-COMMANDED POSITION NOT REACHABLE |
| B1919-11 | FRONT BLOWER MOTOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1919-12 | BLOWER MODULE - CIRCUIT SHORT TO BATTERY |
| B1919-14 | FRONT BLOWER MOTOR CONTROL-CIRCUIT SHORT TO GROUND OR OPEN |
| B1919-15 | FRONT BLOWER MOTOR CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1923-42 | HVAC-GENERAL MEMORY FAILURE |
| B1924-49 | CONTROL HEAD-INTERNAL ELECTRONIC |
| B1931-11 | PTC LOWPOWER RELAY DRIVING COMMAND-CIRCUIT SHORT TO GROUND |
| B1931-15 | PTC LOW POWER RELAY DRIVING COMMAND-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1932-11 | PTC HIGH POWER RELAY DRIVING COMMAND-CIRCUIT SHORT TO GROUND |
| B1932-15 | PTC HIGH POWER RELAY DRIVING COMMAND-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1936-11 | REAR BLOWER MOTOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1936-14 | REAR BLOWER MOTOR CONTROL - CIRCUIT SHORT TO GROUND OR OPEN |
| B1936-15 | REAR BLOWER MOTOR CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN |
| U0019-87 | B CAN - MISSING MESSAGE |
| U0019-88 | B CAN - BUS OFF |
| U1700-86 | IMPLAUSIBLE DATA RECEIVED FROM BCM |
| U1700-87 | BODY CONTROL MODULE - BCM - ABSENT |
| U1701-86 | IMPLAUSIBLE DATA RECEIVED FROM PCM |
| U1701-87 | LOST COMMUNICATION WITH PCM |
| U1703-86 | IMPLAUSIBLE-DATA-RECEIVED-FROM-IPC |
| U1703-87 | LOST-COMMUNICATION-WITH-IPC |
Factory Service Tools
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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.