B1270 OBD-II Trouble Code: Servo Motor Potentiometer Defrost Circuit Short to Battery

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1270 code

B1270 is a diagnostic trouble code (DTC) for "Servo Motor Potentiometer Defrost Circuit Short to Battery". 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 B1270 DIAGNOSTIC Get a fair and transparent estimate upfront

B1270 code definition

The B1270 trouble code identifies a malfunction with the servo motor potentiometer defrost circuit.

What the B1270 code means

The B1270 code is a generic OBD-II trouble code that detects an error with the servo motor potentiometer defrost circuit. The potentiometer controls voltage output into the defrost system, which allows the defroster to operate on a scale, rather than just on or off. When a circuit error is detected from the servo motor potentiometer, then the B1270 trouble code will be stored.

What causes the B1270 code?

Potential causes of the B1270 trouble code include:

What are the symptoms of the B1270 code?

The B1270 code may be accompanied by the check engine soon Warning Light, or a flashing climate control light. It is common for the defroster to not work properly when this code is detected.

How does a mechanic diagnose the B1270 code?

The B1270 code will be diagnosed using a standard OBD-II trouble code scanner. A trustworthy mechanic will use the scanner to view the freeze frame data, and gather information about the code. The mechanic will also look to see if any other codes have been detected. In the event that there are numerous codes present, then the technician will need to address them in the order in which they are displayed on the scanner. The codes will then need to be reset, and the vehicle restarted, to see if the B1270 code returns. If not, then it was most likely triggered inaccurately, or represents an intermittent error.

If the B1270 code remains detected, then the mechanic will need to visually inspect the electrical components associated with the defrost system. All fuses, wires, and connectors should be examined, and the circuit will then need to be tested. Next, the servo motor and potentiometer will be thoroughly inspected.

After any replacements or repairs, the mechanic should reset the trouble codes, restart the vehicle, and check to see if the B1270 code is still detected. This helps the mechanic know when the issue is resolved.

Common mistakes when diagnosing the B1270 code

The most frequently made error when diagnosing the B1270 code is the failure to properly abide by the OBD-II diagnosis protocol. It is extremely important that mechanics follow the protocol at all times, to ensure that all diagnoses and repairs are efficient and accurate.

Often servo motors and potentiometers are unnecessarily replaced before electrical components are inspected.

How serious is the B1270 code?

The B1270 trouble code won’t keep a vehicle from being drivable, but it may keep the defrost system from working. The defrost system is an important safety feature that can greatly aid driver visibility, so a vehicle with this code should be inspected as soon as it is convenient.

What repairs can fix the B1270 code?

Potential repairs for the B1270 code are:

  • Potentiometer replacement
  • Servo motor replacement
  • Replacement or repair of electrical components, including the circuit
  • In rare cases, replacement of the climate control module, body control module, or PCM

Additional comments for consideration regarding the B1270 code

It is extremely rare for the B1270 code to be triggered by a defective control module, so all potential causes of the code should be checked before a failed PCM, body control module, or climate control module is suspected. In the unlikely event that a control module does need to be replaced, it will also need to be reprogrammed.

Need help with a B1270 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.

trouble codes
B1270
OBD-II

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1270 code.

SCHEDULE B1270 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

P0582 OBD-II Trouble Code: Cruise Control Vacuum Control Circuit/Open
P0582 P0582 OBD-II Trouble Code: Cruise Control Vacuum Control Circuit/Open P0582 code definition The P0582 code indicates that there has been a malfunction detected in the cruise control vacuum control circuit by the car’s computer. What the P0582 code...
P2322 OBD-II Trouble Code: Ignition Coil H Primary Control Circuit High
P2322 means there is a fault within the primary or secondary circuit of an ignition coil often due too shorted wires or an corroded oil connector.
B1945 OBD-II Trouble Code: Airbag Crash Sensor #2 Ground Circuit Open
B1945 means there is an open circuit condition in the airbag circuit, likely due to damaged wiring or a faulty sensor.

Related questions

EVAP Vent valve solenoid code p0449

This suggests you may have a bad EVAP control module. A battery voltage is supplied to the evaporative emission (EVAP) canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve...

I have a 1986 Chrysler Laser turbo with 13700 miles that failed emissions. Do oxygen sensors go bad from sitting around too long?

Wow, I almost bought one of these new back in 1986. It is possible that due to age, any number of sensors can be bad, even without a Check Engine Light being set. The best way to determine that is...

Check engine light

Wow... 329,000 miles on your Chevrolet Uplander. Assuming you are still on your original engine, that is a long lived vehicle. If your Check Engine Light is on, YourMechanic will use an electronic code retrieval tool to download the DTC's...

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