NTB21-034A

Classification:
Reference:
HA21-001A
Date:
NTB21-034A
August 6, 2021
AC INOPERATIVE WITH DTC B20C8-14
STORED IN THE IPDM E/R
This bulletin has been amended. See AMENDMENT HISTORY on the last page.
Please discard previous versions of this bulletin.
APPLIED VEHICLES:
2019-2021 Altima (L34)
NOTE: 2021 Rogue (T33) has been removed from this bulletin. Refer to NTB21-072
for 2021 Rogue vehicles.
IF YOU CONFIRM
The AC compressor is not engaging when the AC is in the ON position, as indicated by the
yellow illumination on the AC button,
AND
DTC B20C8-14 ECV (ELECTRICAL CONTROL VALVE) is stored in the IPDM E/R.
ACTION
Follow the SERVICE PROCEDURE beginning on the next page.
IMPORTANT: The purpose of ACTION (above) is to give you a quick idea of the work you
will be performing. You MUST closely follow the entire SERVICE PROCEDURE as it
contains information that is essential to successfully completing this repair.
Nissan Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are
properly trained individuals who have the equipment, tools, safety instruction, and know-how to do a job
properly and safely. NOTE: If you believe that a described condition may apply to a particular vehicle, DO
NOT assume that it does. See your Nissan dealer to determine if this applies to your vehicle.
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SERVICE PROCEDURE
1.
Clear the DTC, and follow the DTC CONFIRMATION PROCEDURE in the ESM.

If DTC B20C8-14 is past, AC compressor operation will be inhibited until the DTC
is cleared.

If DTC B20C8-14 returns after being cleared (either Current or Past status), follow
the ESM diagnosis procedure.
 For models with Automatic Air Conditioning, go to section: VENTILATION,
HEATER & AIR CONDITIONER > HEATER & AIR CONDITIONING
CONTROL SYSTEM > AUTOMATIC AIR CONDITIONING > DTC/CIRCUIT
DIAGNOSIS > B20C8-14 ECV (ELECTRICAL CONTROL VALVE).
 For models with Manual Air Conditioning, go to section: VENTILATION,
HEATER & AIR CONDITIONER > HEATER & AIR CONDITIONING
CONTROL SYSTEM > MANUAL AIR CONDITIONING > DTC/CIRCUIT
DIAGNOSIS > B20C8-14 ECV (ELECTRICAL CONTROL VALVE).
AMENDMENT HISTORY
PUBLISHED DATE REFERENCE
April 22, 2021
NTB21-034
August 6, 2021
NTB21-034A
DESCRIPTION
Original bulletin published
APPLIED VEHICLES revised
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NTB21-034A