Q: Can I drive with B1855 active?

In most cases, yes — but the affected system may not operate correctly. Diagnose and fix promptly.

Q: How much does it cost to fix B1855?

Component replacement typically costs $30–$250. DIY diagnosis with a multimeter can save on labor.

Q: Will the Check Engine Light go off on its own?

If the fault is intermittent, the light may turn off after several drive cycles. However, the underlying issue should still be addressed. ---

This diagnostic article is an original guide created by AIscanAuto for educational and troubleshooting purposes. The technical information about OBD2 DTC codes is based on publicly available automotive diagnostic standards and industry best practices. External links provided are for additional reading and context only — they do not imply endorsement or ownership of third-party content. All repair procedures should be performed by qualified technicians.

DTC B1855: B1855 — Climate Control Air Temperature Internal Sensor Motor Circuit Short To Battery: Causes, Symptoms & Fix

The B1855 OBD2 fault code relates to the Climate Control Air Temperature Internal Sensor Motor circuit. When the circuit short to battery, the module cannot properly monitor or control this body system. At AIscanAuto, we help drivers quickly identify OBD2 trouble codes, understand their root causes, and find the right fix.

B1855 — Climate Control Air Temperature Internal Sensor Motor Circuit Short To Battery: Causes, Symptoms & Fix

The B1855 OBD2 fault code relates to the Climate Control Air Temperature Internal Sensor Motor circuit. When the circuit short to battery, the module cannot properly monitor or control this body system.

At AIscanAuto, we help drivers quickly identify OBD2 trouble codes, understand their root causes, and find the right fix.

Symptoms

Battery warning light
Electrical systems losing power
Possible no-start condition
Battery drain issues

Common Causes

Faulty component — internal damage or wear affecting Climate Control Air Temperature Internal Sensor Motor
Wiring issues — broken, corroded, or chafed wires in the circuit
Connector problems — loose, oxidized, or moisture-damaged pins
a short to battery voltage is detected — connects the signal line directly to 12V, causing constant high voltage
Module input failure — rare, but the control module input stage may be defective

Step-by-Step Diagnosis

Scan with OBD2 tool — Confirm B1855 is active. Check for additional DTCs.
Visual inspection — Examine the Climate Control Air Temperature Internal Sensor Motor wiring and connector for corrosion or damage.
Check voltage and ground — Use a multimeter to verify proper reference voltage.
Test component — Compare readings to factory specs. A stuck or erratic signal confirms failure.
Check for shorts/opens — Perform continuity tests on the wiring between the component and control module.

Repair & Solutions

If the component is defective, replace the Climate Control Air Temperature Internal Sensor Motor with an OEM or quality aftermarket part.
Repair any damaged wiring or connectors using proper methods.
Clear the DTC with an OBD2 scanner and test drive to verify the code does not return.
If the code persists after component replacement, inspect the control module connector.

Related Codes

B1852 — Climate Control Temperature Differential Circuit Short To Ground
B1853 — Climate Control Air Temperature Internal Sensor Motor Circuit Failure
B1854 — Climate Control Air Temperature Internal Sensor Motor Circuit Open

DTC B1855: B1855 — Climate Control Air Temperature Internal Sensor Motor Circuit Short To Battery: Causes, Symptoms & Fix

B1855 Diagnostic Trouble Code