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.
2016 Fiat 500L Easy, Automatic TransFACTORY OEM SERVICE PROCEDURE
DTC Index: HVAC
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B1901-11 | FRONT-MODE-DOOR-1-SENSOR-CONTROL |
| B1901-15 | FRONT-MODE-DOOR-1-SENSOR-CONTROL |
| 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-COMMAND |
| B1905-11 | MAIN LEFT TEMPERATURE DOOR 1 SENSOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1905-15 | MAIN LEFT TEMPERATURE DOOR 1 SENSOR CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN |
| 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 |
| B1907-11 | RIGHT TEMPERATURE DOOR 1 SENSOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1907-15 | RIGHT TEMPERATURE DOOR 1 SENSOR CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1908-11 | RIGHT TEMPERATURE DOOR 1 ACTUATOR CONTROL-CIRCUIT SHORT TO GROUND |
| B1908-12 | RIGHT TEMPERATURE DOOR 1 ACTUATOR CONTROL-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1908-77 | RIGHT TEMPERATURE DOOR 1-COMMANDED POSITION NO 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 |
| B1912-11 | RIGHT PANEL DUCT TEMPERATURE SENSOR-CIRCUIT SHORT TO GROUND |
| B1912-15 | RIGHT PANEL DUCT TEMPERATURE SENSOR-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1913-11 | RIGHT FLOOR DUCT TEMPERATURE SENSOR-CIRCUIT SHORT TO GROUND |
| B1913-15 | RIGHT FLOOR DUCT TEMPERATURE SENSOR-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1914-11 | LEFT PANEL DUCT TEMPERATURE SENSOR-CIRCUIT SHORT TO GROUND |
| B1914-15 | LEFT PANEL DUCT TEMPERATURE SENSOR-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1915-11 | LEFT FLOOR DUCT TEMPERATURE SENSOR - CIRCUIT SHORT TO GROUND |
| B1915-15 | LEFT FLOOR DUCT TEMPERATURE SENSOR-CIRCUIT TO BATTERY OR OPEN |
| B1919-16 | BLOWER MOTOR CONTROL-CIRCUIT VOLTAGE BELOW THRESHOLD |
| B1919-17 | BLOWER MOTOR CONTROL-CIRCUIT VOLTAGE ABOVE THRESHOLD |
| B1923-42 | GENERAL MEMORY FAILURE |
| B1924-49 | CONTROL HEAD - INTERNAL ELECTRONIC FAILURE |
| B1926-11 | MODE/TEMPERATURE DOOR VOLTAGE REFERENCE-CIRCUIT SHORT TO GROUND |
| B1926-12 | MODE/TEMPERATURE DOOR VOLTAGE REFERENCE-CIRCUIT SHORT TO BATTERY |
| B1928-11 | CABIN TEMPERATURE SENSOR-CIRCUIT SHORT TO GROUND |
| B1928-15 | CABIN TEMPERATURE SENSOR-CIRCUIT SHORT TO BATTERY OR OPEN |
| B1928-31 | CABIN TEMPERATURE SENSOR-NO SIGNAL |
| B1928-96 | CABIN TEMPERATURE SENSOR-COMPONENT INTERNAL FAILURE |
| B1931-11 | PTC LOW POWER 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 |
| U0019-87 | CAN B BUS - NO SIGNAL |
| U0019-88 | CAN B BUS OFF |
| U1700-86 | IMPLAUSIBLE DATA RECEIVED FROM BCM |
| U1700-87 | LOST COMMUNICATION WITH BCM |
| 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.