B1862 OBD-II Trouble Code: Climate Control A/C Lock Sensor Failure

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1862 code

B1862 is a diagnostic trouble code (DTC) for "Climate Control A/C Lock Sensor Failure". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE B1862 DIAGNOSTIC Get a fair and transparent estimate upfront

B1862 code definition

The B1862 trouble code detects a malfunction with the climate control A/C lock sensor.

What the B1862 code means

The B1862 code is a standard OBD-II trouble code that notes a climate control A/C lock sensor failure. The lock sensor (also known as an A/C speed sensor) is responsible for measuring the revolutions per minute (RPM) of the air conditioner compressor. The compressor RPM is then compared to the engine RPM, to make sure that they are both within a similar range. If the climate control module, body control module, or powertrain control module (PCM) fail to receive a signal from the A/C lock sensor, or note that the engine and compressor speed are not similar, then the B1862 code may be stored.

What causes the B1862 code?

Two issues can commonly cause the B1862 trouble code: a defective A/C lock sensor, and damaged electrical components (such as wires, connectors, and fuses) in the climate control system. While very rare, it is also possible that a malfunctioning PCM, body control module, or climate control module is responsible for this code.

What are the symptoms of the B1862 code?

When the B1862 trouble code is stored, the air conditioning system will most likely not work. Sometimes the air conditioner will fail completely, while other times it will run for five seconds, and then shut off. The A/C light on the climate controls may also flash.

How does a mechanic diagnose the B1862 code?

The B1862 code will be diagnosed using a standard OBD-II trouble code scanner. A trustworthy technician can assess the code using the freeze frame data from the scanner, and can also check for additional trouble codes that may be present. If there are numerous codes detected, the mechanic will address them in the order in which they are displayed. The technician will then reset the trouble codes, restart the vehicle, and see if the B1862 code is still detected. If not, then it was likely incorrectly detected, or the result of an intermittent error.

If the code remains, then the mechanic should begin by visually inspecting the electrical components in the system. Any blown fuses, corroded or open connectors, and shorted wires will need to be replaced. The A/C lock sensor will then be inspected. If the sensor is defective, then the entire A/C compressor may need to be replaced, depending on the vehicle.

After any components are replaced, the trouble codes will again be reset, the vehicle restarted, and the B1862 code checked for. This allows the mechanic to be alerted as soon as the issue is fully resolved.

Common mistakes when diagnosing the B1862 code

The most frequently made mistake when diagnosing this code comes from a failure to properly follow the OBD-II trouble code diagnosis protocol. It’s important that technicians always follow the protocol, as it helps avoid erroneous repairs, and ensures accurate and efficient inspections. A/C lock sensors and compressors are often inaccurately replaced when electrical components are overlooked.

How serious is the B1862 code?

The B1862 code will likely keep the air conditioning system from operating. As with all trouble codes, an inspection should be scheduled as soon as the code is detected.

What repairs can fix the B1862 code?

Repairs for the B1862 code include:

Additional comments for consideration regarding the B1862 code

The B1862 code is a manufacturer specific trouble code, which means that the definition varies depending on the automaker. This code signals an A/C lock sensor failure in some vehicles, but detects a different problem in other makes. The mechanic should always note what vehicle is being worked on when diagnosing the B1862 code.

Need help with a B1862 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

OBD-II
trouble codes
B1862

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1862 code.

SCHEDULE B1862 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P3465 OBD-11 Trouble Code: Cylinder 9 Deactivation/Intake Valve Control Circuit/Open
What What the P3465 code means This code indicates that there is a problem with the exhaust valve on cylinder number 9. When your vehicle’s powertrain control module (PCM) recognizes that the measured values of the mass airflow sensor, the...
P2344 OBD-II Trouble Code: Cylinder #9 Above Knock Threshold
P2344 means an issue with the cylinder 9 knock sensor circuit. Some causes are faulty knock sensor, damaged wires, and cylinder firing malfunctions.
P2662 OBD-II Trouble Code: B Rocker Arm Actuator Sys Stuck On Bank 2
P2662 means an issue within the rocker arm actuator function which may cause rough idling, choppy acceleration and poor engine performance.

Related questions

rough idle and misfiring at stops
Lets start with what the codes mean. P0060 (https://www.yourmechanic.com/article/p0060-obd-ii-trouble-code-ho2s-heater-resistance-bank-2-sensor-2-by-blake-griffin_2) - indicates that there is a network failure to the ECU. One or more control modules are not communicating. This is usually caused by a bad ECU, poor electrical connections from...
My car shakes or vibrate at a stop
Hi there: Unfortunately, neither of those three error codes are associated with a component that is causing your vibration issue. The P0135 (https://www.yourmechanic.com/article/p0135-obd-ii-trouble-code-o2-sensor-heater-circuit-malfunction-bank-1-sensor-1-by-jay-safford) is related to the O2 sensor, and P0421 (https://www.yourmechanic.com/article/p0421-obd-ii-trouble-code-warm-up-catalyst-efficiency-below-threshold-bank-1-by-andrew-quinn) and P0401 (https://www.yourmechanic.com/article/p0401-obd-ii-trouble-code-exhaust-gas-recirculation-flow-malfunction-by-jay-safford) are related to catalytic converter...
Timing chain problem?
It could very well be a timing chain problem (https://www.yourmechanic.com/services/timing-chain-replacement). The P0016 and 17 indicate that the camshaft sensors (https://www.yourmechanic.com/services/camshaft-position-sensor-replacement) are sensing the camshaft in a position that does not logically correspond with the crankshaft. The P0302 (https://www.yourmechanic.com/article/p0302-obd-ii-trouble-code-cylinder-2-misfire-detected-by-jamahl-walker) and P0355...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com