B1968 OBD-II Trouble Code: AC Water Pump Detection Circuit Failure

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1968 code

B1968 is a diagnostic trouble code (DTC) for "AC Water Pump Detection Circuit 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE B1968 DIAGNOSTIC Get a fair and transparent estimate upfront

B1968 code definition

The B1968 trouble code detects an AC water pump detection circuit malfunction.

What the B1968 code means

The B1968 code is a generic OBD-II trouble code that notes a circuit error in the AC water pump detection system. The AC water pump is part of the climate control system, and is used to help adjust the air temperature that enters the vehicle’s cabin. The detection system monitors the water pump and relays information to the climate control unit, so that the temperature can be properly adjusted. If the climate control module, body control module, or powertrain control module (PCM) receive an abnormal voltage reading from the AC water pump detection system, then the B1968 trouble code may be stored.

What causes the B1968 code?

The B1968 code is most commonly caused by damaged electrical components in the AC system. Any wires that are shorted or open, connectors that are loose or corroded, or fuses that are blown can trigger the code. It is also fairly common for the code to be caused by a faulty detection sensor or a failed AC water pump. While rare, a malfunctioning climate control module can also cause the code to be stored.

What are the symptoms of the B1968 code?

The B1968 trouble code is usually accompanied by an illuminated check engine soon warning lighton the dashboard, and possibly a flashing AC light on the center console climate controls. It is likely that the climate control system will not function properly, which may result in a lack of hot air, erratic temperature from both the heater and the air conditioner, and a failed defroster.

How does a mechanic diagnose the B1968 code?

The B1968 trouble code will be diagnosed using a standard OBD-II trouble code scanner. A trustworthy technician will use the scanner to look at the freeze frame data and gather information about the code. The mechanic will also use the scanner to see if any additional trouble codes are present, as codes need to be addressed in the order that they appear in. The codes will then be reset, the vehicle restarted, and the B1968 code checked for. If the code is no longer present after this reset, then an erroneous detection, or an intermittent error are the most likely problems.

If the code is still present, then the mechanic will visually inspect all of the electrical components in the climate control system. Any damaged or otherwise compromised wires, fuses, or connectors will need to be replaced. The AC water pump and detection system should then be inspected.

After any components are replaced, the trouble codes will once again need to be reset, the vehicle again restarted, and the B1968 code checked for once more. This will allow the mechanic to know as soon as the problem has been identified and resolved.

Common mistakes when diagnosing the B1968 code

The most common error when diagnosing the B1968 code comes from not following the OBD-II trouble code diagnosis protocol. It is important that mechanics always follow the protocol step by step, to make sure that all diagnoses are thorough and accurate.

Properly working AC water pumps are often erroneously replaced because damaged electrical components are not repaired.

How serious is the B1968 code?

The B1968 trouble code will not keep a car from being drivable, or even result in any drivability concerns. However, the climate control system will likely act erratically, or even not at all, which can be a hassle, especially when driving in harsh weather. As with all trouble codes, the B1968 code should be addressed as soon as possible after being detected.

What repairs can fix the B1968 code?

Possible repairs for the B1968 trouble code include:

Additional comments for consideration regarding the B1968 code

The B1968 code is a manufacturer specific trouble code. Manufacturer specific codes are codes that have varying definitions depending on the automaker. So while this code signals an AC water pump detection circuit failure for some cars, it can detect a very different body problem in other vehicles. Mechanics should always be aware of the make and model that they are inspecting when diagnosing this trouble code.

Need help with a B1968 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.

B1968
trouble codes
OBD-II

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1968 code.

SCHEDULE B1968 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,170

Rating Summary
4,765
197
50
27
131
4,765
197
50
27
131

Fred

16 years of experience
364 reviews
Fred
16 years of experience
Mercedes-Benz E500 - Check Engine Light is on - Conroe, Texas
Fred was very friendly and thorough to get to the root of the issue. Even when he could not find a fault to why my engine light was on, he went above and beyond to make absolutely sure that the concern was minimized. Turns out, all that needed to be done was a reset but his diagnostic to address my issues was very intricate and appreciated.

David

17 years of experience
37 reviews
David
17 years of experience
Chevrolet Cruze - Check Engine Light is on - Aurora, Colorado
David was on time, professionalisms & honest! I would definitely request him again and pass along to friends/family.

John

18 years of experience
18 reviews
John
18 years of experience
Dodge Ram 1500 - Check Engine Light is on - Memphis, Tennessee
Demonstrated good integrity. Advised me when work I thought needed done was unnecessary and was helpful in identifying issues that needed to be addressed

Robert

21 years of experience
17 reviews
Robert
21 years of experience
Chrysler 200 - Check Engine Light is on - Fort Worth, Texas
Robert did a good job working on my car and letting me know what's needed to keep my car driving smoothly.


More related articles

P2571 OBD-II Trouble Code: Direct Ozone Reduction Catalyst Temperature Sensor Circuit 4 Intermittent/Erratic
P2571 P2571 code definition A P2571 trouble code indicates that the Powertrain Control Module (PCM) has detected higher-than-normal voltage from the direct control ozone reduction catalyst temperature sensor. Other related trouble codes include P2567, P2568, P2569, P2570, P2572, P2573,...
P0665 OBD-II Trouble Code: Intake Manifold Tuning Valve Control Circuit High Bank 2
P0665 means that there is an electrical malfunction in the intake manifold tuning valve control circuit due to a faulty driver or fuel injector.
B1971 OBD-II Trouble Code: Passenger Seatback Rearward Switch Circuit Short to Ground
B1971 means there is an error with the seatback rearward switch. This is most likely due to damaged electrical components or a bad switch.

Related questions

P0301 and P0411 codes on vw Passat 2003 1.8lt turbo

Fault code P0301 is a misfire on cylinder # 1 and P0411 is a fault for Incorrect Secondary Air Injection. Trouble code P0301 is most likely due to a faulty ignition coil. To verify before purchasing one, try swapping say...

I have a trouble code that states my fuel pressure rail sensor is inappropriately high.

Hello there, a few common faults will cause your 2010 Volkswagen CC to have a high fuel pressure code. There are two paths for this, either your car has high fuel pressure, or the car is reading the fuel pressure...

My truck jumps and shakes when accelerating

It is possible for problems with the ignition system to cause this issue, including spark plugs or ignition coils not firing under load. You should have a scan for trouble codes done to check for codes related to the misfiring....

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